diff --git a/EVENTS.txt b/EVENTS.txt
index 25a51516b4..af686b9cdf 100644
--- a/EVENTS.txt
+++ b/EVENTS.txt
@@ -191,6 +191,12 @@ StartPersonalGroupNav: beginning of personal group nav menu
 EndPersonalGroupNav: end of personal group nav menu (good place to add a menu item)
 - $action: action object being shown
 
+StartGroupGroupNav: Showing the group nav menu
+- $action: the current action
+
+EndGroupGroupNav: At the end of the group nav menu
+- $action: the current action
+
 StartEndHTML: just before the </html> tag
 - $action: action object being shown
 
@@ -489,6 +495,10 @@ ChangePassword: Handle a password change request
 - $newpassword: the desired new password
 - &$errormsg: set this to an error message if the password could not be changed. If the password was changed, leave this as false
 
+CanUserChangeField: Determines if a user is allowed to change a specific profile field
+- $nickname: nickname of the user who would like to know which of their profile fields are mutable
+- $field: name of the field the user wants to change (nickname, fullname, password, avatar, etc)
+
 UserDeleteRelated: Specify additional tables to delete entries from when deleting users
 - $user: User object
 - &$related: array of DB_DataObject class names to delete entries on matching user_id.
diff --git a/actions/allrss.php b/actions/allrss.php
index 4a5d15c7b7..28b1be27d8 100644
--- a/actions/allrss.php
+++ b/actions/allrss.php
@@ -56,7 +56,7 @@ class AllrssAction extends Rss10Action
      *
      * @param array $args Web and URL arguments
      *
-     * @return boolean false if user does not exist
+     * @return boolean false if user doesn't exist
      */
     function prepare($args)
     {
diff --git a/actions/apiaccountratelimitstatus.php b/actions/apiaccountratelimitstatus.php
index c7c0e7c001..96179f175b 100644
--- a/actions/apiaccountratelimitstatus.php
+++ b/actions/apiaccountratelimitstatus.php
@@ -36,7 +36,7 @@ if (!defined('STATUSNET')) {
 require_once INSTALLDIR . '/lib/apibareauth.php';
 
 /**
- * We do not have a rate limit, but some clients check this method.
+ * We don't have a rate limit, but some clients check this method.
  * It always returns the same thing: 150 hits left.
  *
  * @category API
diff --git a/actions/apifriendshipsdestroy.php b/actions/apifriendshipsdestroy.php
index fb73624c9a..3d9b7e001c 100644
--- a/actions/apifriendshipsdestroy.php
+++ b/actions/apifriendshipsdestroy.php
@@ -113,7 +113,7 @@ class ApiFriendshipsDestroyAction extends ApiAuthAction
             return;
         }
 
-        // Do not allow unsubscribing from yourself!
+        // Don't allow unsubscribing from yourself!
 
         if ($this->user->id == $this->other->id) {
             $this->clientError(
diff --git a/actions/attachment.php b/actions/attachment.php
index ca9e578457..6981354d10 100644
--- a/actions/attachment.php
+++ b/actions/attachment.php
@@ -146,7 +146,7 @@ class AttachmentAction extends Action
     }
 
     /**
-     * Do not show local navigation
+     * Don't show local navigation
      *
      * @return void
      */
@@ -170,7 +170,7 @@ class AttachmentAction extends Action
     }
 
     /**
-     * Do not show page notice
+     * Don't show page notice
      *
      * @return void
      */
diff --git a/actions/avatarbynickname.php b/actions/avatarbynickname.php
index 1a6925e119..537950792f 100644
--- a/actions/avatarbynickname.php
+++ b/actions/avatarbynickname.php
@@ -49,7 +49,7 @@ class AvatarbynicknameAction extends Action
      *
      * @param array $args query arguments
      * 
-     * @return boolean false if nickname or user is not found
+     * @return boolean false if nickname or user isn't found
      */
     function handle($args)
     {
diff --git a/actions/block.php b/actions/block.php
index 408f16434b..b125d2d8b6 100644
--- a/actions/block.php
+++ b/actions/block.php
@@ -146,8 +146,8 @@ class BlockAction extends Action
                 $this->hidden($k, $v);
             }
         }
-        $this->submit('form_action-no', _('No'), 'submit form_action-primary', 'no', _("Do not block this user from this group"));
-        $this->submit('form_action-yes', _('Yes'), 'submit form_action-secondary', 'yes', _('Block this user from this group'));
+        $this->submit('form_action-no', _('No'), 'submit form_action-primary', 'no', _("Do not block this user"));
+        $this->submit('form_action-yes', _('Yes'), 'submit form_action-secondary', 'yes', _('Block this user'));
         $this->elementEnd('fieldset');
         $this->elementEnd('form');
     }
diff --git a/actions/groupblock.php b/actions/groupblock.php
index 133101eb7a..faf18c6adb 100644
--- a/actions/groupblock.php
+++ b/actions/groupblock.php
@@ -95,7 +95,7 @@ class GroupblockAction extends Action
             $this->clientError(_('User is already blocked from group.'));
             return false;
         }
-        // XXX: could have proactive blocks, but we do not have UI for it.
+        // XXX: could have proactive blocks, but we don't have UI for it.
         if (!$this->profile->isMember($this->group)) {
             $this->clientError(_('User is not a member of group.'));
             return false;
@@ -151,17 +151,19 @@ class GroupblockAction extends Action
     function areYouSureForm()
     {
         $id = $this->profile->id;
+        $this->elementStart('form', array('id' => 'block-' . $id,
+                                           'method' => 'post',
+                                           'class' => 'form_settings form_entity_block',
+                                           'action' => common_local_url('groupblock')));
+        $this->elementStart('fieldset');
+        $this->hidden('token', common_session_token());
+        $this->element('legend', _('Block user'));
         $this->element('p', null,
                        sprintf(_('Are you sure you want to block user "%s" from the group "%s"? '.
                                  'They will be removed from the group, unable to post, and '.
                                  'unable to subscribe to the group in the future.'),
                                $this->profile->getBestName(),
                                $this->group->getBestName()));
-        $this->elementStart('form', array('id' => 'block-' . $id,
-                                           'method' => 'post',
-                                           'class' => 'block',
-                                           'action' => common_local_url('groupblock')));
-        $this->hidden('token', common_session_token());
         $this->hidden('blockto-' . $this->profile->id,
                       $this->profile->id,
                       'blockto');
@@ -173,8 +175,9 @@ class GroupblockAction extends Action
                 $this->hidden($k, $v);
             }
         }
-        $this->submit('no', _('No'));
-        $this->submit('yes', _('Yes'));
+        $this->submit('form_action-no', _('No'), 'submit form_action-primary', 'no', _("Do not block this user from this group"));
+        $this->submit('form_action-yes', _('Yes'), 'submit form_action-secondary', 'yes', _('Block this user from this group'));
+        $this->elementEnd('fieldset');
         $this->elementEnd('form');
     }
 
diff --git a/actions/login.php b/actions/login.php
index 679817520f..ad57dd6678 100644
--- a/actions/login.php
+++ b/actions/login.php
@@ -159,7 +159,7 @@ class LoginAction extends Action
         $url = common_get_returnto();
 
         if ($url) {
-            // We do not have to return to it again
+            // We don't have to return to it again
             common_set_returnto(null);
         } else {
             $url = common_local_url('all',
diff --git a/actions/logout.php b/actions/logout.php
index 7e768fca63..1e0adae575 100644
--- a/actions/logout.php
+++ b/actions/logout.php
@@ -81,7 +81,7 @@ class LogoutAction extends Action
     {
         common_set_user(null);
         common_real_login(false); // not logged in
-        common_forgetme(); // do not log back in!
+        common_forgetme(); // don't log back in!
     }
 
 }
diff --git a/actions/newmessage.php b/actions/newmessage.php
index 73307fdfc5..0db2e7181c 100644
--- a/actions/newmessage.php
+++ b/actions/newmessage.php
@@ -61,7 +61,7 @@ class NewmessageAction extends Action
     /**
      * Title of the page
      *
-     * Note that this usually does not get called unless something went wrong
+     * Note that this usually doesn't get called unless something went wrong
      *
      * @return string page title
      */
diff --git a/actions/newnotice.php b/actions/newnotice.php
index fc06e5c986..fbd7ab6bce 100644
--- a/actions/newnotice.php
+++ b/actions/newnotice.php
@@ -59,7 +59,7 @@ class NewnoticeAction extends Action
     /**
      * Title of the page
      *
-     * Note that this usually does not get called unless something went wrong
+     * Note that this usually doesn't get called unless something went wrong
      *
      * @return string page title
      */
diff --git a/actions/opensearch.php b/actions/opensearch.php
index b205d2fe27..861b53d7d8 100644
--- a/actions/opensearch.php
+++ b/actions/opensearch.php
@@ -52,7 +52,7 @@ class OpensearchAction extends Action
      *
      * @param array $args query arguments
      * 
-     * @return boolean false if user does not exist
+     * @return boolean false if user doesn't exist
      */
     function handle($args)
     {
diff --git a/actions/passwordsettings.php b/actions/passwordsettings.php
index 6658d279f2..024f1287f2 100644
--- a/actions/passwordsettings.php
+++ b/actions/passwordsettings.php
@@ -58,6 +58,19 @@ class PasswordsettingsAction extends AccountSettingsAction
         return _('Change password');
     }
 
+    function prepare($args){
+        parent::prepare($args);
+
+        $user = common_current_user();
+
+        Event::handle('CanUserChangeField', array($user->nickname, 'password'));
+
+        if(! $fields['password']){
+            //user is not allowed to change his password
+            $this->clientError(_('You are not allowed to change your password'));
+        }
+    }
+
     /**
      * Instructions for use
      *
@@ -86,6 +99,7 @@ class PasswordsettingsAction extends AccountSettingsAction
     function showContent()
     {
         $user = common_current_user();
+
         $this->elementStart('form', array('method' => 'POST',
                                           'id' => 'form_password',
                                           'class' => 'form_settings',
@@ -97,7 +111,7 @@ class PasswordsettingsAction extends AccountSettingsAction
 
 
         $this->elementStart('ul', 'form_data');
-        // Users who logged in with OpenID will not have a pwd
+        // Users who logged in with OpenID won't have a pwd
         if ($user->password) {
             $this->elementStart('li');
             $this->password('oldpassword', _('Old password'));
diff --git a/actions/register.php b/actions/register.php
index c4f6760aa9..57f8e7bdf0 100644
--- a/actions/register.php
+++ b/actions/register.php
@@ -174,7 +174,7 @@ class RegisterAction extends Action
             $bio      = $this->trimmed('bio');
             $location = $this->trimmed('location');
 
-            // We do not trim these... whitespace is OK in a password!
+            // We don't trim these... whitespace is OK in a password!
             $password = $this->arg('password');
             $confirm  = $this->arg('confirm');
 
diff --git a/actions/showgroup.php b/actions/showgroup.php
index ae956befa3..a4af29391d 100644
--- a/actions/showgroup.php
+++ b/actions/showgroup.php
@@ -418,7 +418,7 @@ class ShowgroupAction extends GroupDesignAction
         // XXX: WORM cache this
         $members = $this->group->getMembers();
         $members_count = 0;
-        /** $member->count() does not work. */
+        /** $member->count() doesn't work. */
         while ($members->fetch()) {
             $members_count++;
         }
diff --git a/actions/showmessage.php b/actions/showmessage.php
index cf3a819c11..db757948ba 100644
--- a/actions/showmessage.php
+++ b/actions/showmessage.php
@@ -137,7 +137,7 @@ class ShowmessageAction extends MailboxAction
     }
     
     /**
-     * Do not show local navigation
+     * Don't show local navigation
      *
      * @return void
      */
@@ -147,7 +147,7 @@ class ShowmessageAction extends MailboxAction
     }
     
     /**
-     * Do not show page notice
+     * Don't show page notice
      *
      * @return void
      */
@@ -157,7 +157,7 @@ class ShowmessageAction extends MailboxAction
     }
 
     /**
-     * Do not show aside
+     * Don't show aside
      *
      * @return void
      */
@@ -167,7 +167,7 @@ class ShowmessageAction extends MailboxAction
     }
  
     /**
-     * Do not show any instructions
+     * Don't show any instructions
      *
      * @return string
      */
diff --git a/actions/shownotice.php b/actions/shownotice.php
index 688089f027..5d16fdad9e 100644
--- a/actions/shownotice.php
+++ b/actions/shownotice.php
@@ -208,7 +208,7 @@ class ShownoticeAction extends OwnerDesignAction
     }
 
     /**
-     * Do not show local navigation
+     * Don't show local navigation
      *
      * @return void
      */
@@ -234,7 +234,7 @@ class ShownoticeAction extends OwnerDesignAction
     }
 
     /**
-     * Do not show page notice
+     * Don't show page notice
      *
      * @return void
      */
@@ -244,7 +244,7 @@ class ShownoticeAction extends OwnerDesignAction
     }
 
     /**
-     * Do not show aside
+     * Don't show aside
      *
      * @return void
      */
diff --git a/actions/showstream.php b/actions/showstream.php
index 4952ebdb7e..663638c18a 100644
--- a/actions/showstream.php
+++ b/actions/showstream.php
@@ -253,7 +253,7 @@ class ShowstreamAction extends ProfileAction
     }
 }
 
-// We do not show the author for a profile, since we already know who it is!
+// We don't show the author for a profile, since we already know who it is!
 
 class ProfileNoticeList extends NoticeList
 {
diff --git a/actions/sup.php b/actions/sup.php
index a199f247eb..5daf0a1c1d 100644
--- a/actions/sup.php
+++ b/actions/sup.php
@@ -61,7 +61,7 @@ class SupAction extends Action
         $notice = new Notice();
 
         # XXX: cache this. Depends on how big this protocol becomes;
-        # Re-doing this query every 15 seconds is not the end of the world.
+        # Re-doing this query every 15 seconds isn't the end of the world.
 
         $divider = common_sql_date(time() - $seconds);
 
diff --git a/actions/twitapisearchatom.php b/actions/twitapisearchatom.php
index 511d7cdc66..7d618c471f 100644
--- a/actions/twitapisearchatom.php
+++ b/actions/twitapisearchatom.php
@@ -250,7 +250,7 @@ class TwitapisearchatomAction extends ApiAction
         }
 
         // FIXME: this alternate link is not quite right because our
-        // web-based notice search does not support a rpp (responses per
+        // web-based notice search doesn't support a rpp (responses per
         // page) param yet
 
         $this->element('link', array('type' => 'text/html',
diff --git a/actions/twitapitrends.php b/actions/twitapitrends.php
index 2d17e77cc8..779405e6d6 100644
--- a/actions/twitapitrends.php
+++ b/actions/twitapitrends.php
@@ -55,7 +55,7 @@ class TwitapitrendsAction extends ApiAction
      *
      * @param array $args Web and URL arguments
      *
-     * @return boolean false if user does not exist
+     * @return boolean false if user doesn't exist
      */
     function prepare($args)
     {
diff --git a/classes/File_redirection.php b/classes/File_redirection.php
index c951c1ee77..08a6e8d8be 100644
--- a/classes/File_redirection.php
+++ b/classes/File_redirection.php
@@ -53,7 +53,7 @@ class File_redirection extends Memcached_DataObject
             'connect_timeout' => 10, // # seconds to wait
             'max_redirs' => $redirs, // # max number of http redirections to follow
             'follow_redirects' => true, // Follow redirects
-            'store_body' => false, // We will not need body content here.
+            'store_body' => false, // We won't need body content here.
         ));
         return $request;
     }
@@ -81,12 +81,12 @@ class File_redirection extends Memcached_DataObject
         }
         try {
             $request = self::_commonHttp($short_url, $redirs);
-            // Do not include body in output
+            // Don't include body in output
             $request->setMethod(HTTP_Request2::METHOD_HEAD);
             $response = $request->send();
 
             if (405 == $response->getStatus()) {
-                // Server does not support HEAD method? Can this really happen?
+                // Server doesn't support HEAD method? Can this really happen?
                 // We'll try again as a GET and ignore the response data.
                 $request = self::_commonHttp($short_url, $redirs);
                 $response = $request->send();
@@ -178,7 +178,7 @@ class File_redirection extends Memcached_DataObject
             case 'aim':
             case 'jabber':
             case 'xmpp':
-                // do not touch anything
+                // don't touch anything
                 break;
 
             default:
diff --git a/classes/Notice.php b/classes/Notice.php
index 32a8b693c0..9886875cb7 100644
--- a/classes/Notice.php
+++ b/classes/Notice.php
@@ -146,7 +146,7 @@ class Notice extends Memcached_DataObject
 
         /* Add them to the database */
         foreach(array_unique($hashtags) as $hashtag) {
-            /* elide characters we do not want in the tag */
+            /* elide characters we don't want in the tag */
             $this->saveTag($hashtag);
         }
         return true;
@@ -1105,7 +1105,7 @@ class Notice extends Memcached_DataObject
             if (empty($recipient)) {
                 continue;
             }
-            // Do not save replies from blocked profile to local user
+            // Don't save replies from blocked profile to local user
             $recipient_user = User::staticGet('id', $recipient->id);
             if (!empty($recipient_user) && $recipient_user->hasBlocked($sender)) {
                 continue;
@@ -1131,7 +1131,7 @@ class Notice extends Memcached_DataObject
                 $tagged = Profile_tag::getTagged($sender->id, $tag);
                 foreach ($tagged as $t) {
                     if (!$replied[$t->id]) {
-                        // Do not save replies from blocked profile to local user
+                        // Don't save replies from blocked profile to local user
                         $t_user = User::staticGet('id', $t->id);
                         if ($t_user && $t_user->hasBlocked($sender)) {
                             continue;
diff --git a/classes/Profile.php b/classes/Profile.php
index a50f4951de..7c1e9db332 100644
--- a/classes/Profile.php
+++ b/classes/Profile.php
@@ -101,7 +101,7 @@ class Profile extends Memcached_DataObject
         }
 
         foreach (array(AVATAR_PROFILE_SIZE, AVATAR_STREAM_SIZE, AVATAR_MINI_SIZE) as $size) {
-            # We do not do a scaled one if original is our scaled size
+            # We don't do a scaled one if original is our scaled size
             if (!($avatar->width == $size && $avatar->height == $size)) {
 
                 $scaled_filename = $imagefile->resize($size);
@@ -174,7 +174,7 @@ class Profile extends Memcached_DataObject
 
     function getNotices($offset=0, $limit=NOTICES_PER_PAGE, $since_id=0, $max_id=0, $since=null)
     {
-        // XXX: I'm not sure this is going to be any faster. It probably is not.
+        // XXX: I'm not sure this is going to be any faster. It probably isn't.
         $ids = Notice::stream(array($this, '_streamDirect'),
                               array(),
                               'profile:notice_ids:' . $this->id,
diff --git a/classes/User.php b/classes/User.php
index c529b82e0b..9b90ce61bf 100644
--- a/classes/User.php
+++ b/classes/User.php
@@ -87,7 +87,7 @@ class User extends Memcached_DataObject
         return (is_null($sub)) ? false : true;
     }
 
-    // 'update' will not write key columns, so we have to do it ourselves.
+    // 'update' won't write key columns, so we have to do it ourselves.
 
     function updateKeys(&$orig)
     {
@@ -384,7 +384,7 @@ class User extends Memcached_DataObject
                 return false;
             }
 
-            // Otherwise, cache does not have all faves;
+            // Otherwise, cache doesn't have all faves;
             // fall through to the default
         }
 
@@ -463,7 +463,7 @@ class User extends Memcached_DataObject
     {
         $cache = common_memcache();
         if ($cache) {
-            // Faves do not happen chronologically, so we need to blow
+            // Faves don't happen chronologically, so we need to blow
             // ;last cache, too
             $cache->delete(common_cache_key('fave:ids_by_user:'.$this->id));
             $cache->delete(common_cache_key('fave:ids_by_user:'.$this->id.';last'));
diff --git a/db/08to09.sql b/db/08to09.sql
index a0e37f0f14..1d37a759d8 100644
--- a/db/08to09.sql
+++ b/db/08to09.sql
@@ -42,3 +42,12 @@ create table login_token (
     constraint primary key (user_id)
 ) ENGINE=InnoDB CHARACTER SET utf8 COLLATE utf8_bin;
 
+alter table fave
+    drop index fave_user_id_idx,
+    add index fave_user_id_idx (user_id,modified);
+
+alter table subscription
+    drop index subscription_subscriber_idx,
+    add index subscription_subscriber_idx (subscriber,created),
+    drop index subscription_subscribed_idx,
+    add index subscription_subscribed_idx (subscribed,created);
diff --git a/db/08to09_pg.sql b/db/08to09_pg.sql
index 197fcabfdb..004c77b365 100644
--- a/db/08to09_pg.sql
+++ b/db/08to09_pg.sql
@@ -48,3 +48,12 @@ create table login_token (
     constraint primary key (user_id)
 );
 
+alter table fave
+    drop index fave_user_id_idx,
+    add index fave_user_id_idx using btree(user_id,modified);
+
+alter table subscription
+    drop index subscription_subscriber_idx,
+    add index subscription_subscriber_idx using btree(subscriber,created),
+    drop index subscription_subscribed_idx,
+    add index subscription_subscribed_idx using btree(subscribed,created);
diff --git a/db/statusnet.sql b/db/statusnet.sql
index 3ed4e2c48b..2983c67cfc 100644
--- a/db/statusnet.sql
+++ b/db/statusnet.sql
@@ -107,8 +107,8 @@ create table subscription (
     modified timestamp comment 'date this record was modified',
 
     constraint primary key (subscriber, subscribed),
-    index subscription_subscriber_idx (subscriber),
-    index subscription_subscribed_idx (subscribed),
+    index subscription_subscriber_idx (subscriber, created),
+    index subscription_subscribed_idx (subscribed, created),
     index subscription_token_idx (token)
 ) ENGINE=InnoDB CHARACTER SET utf8 COLLATE utf8_bin;
 
@@ -165,7 +165,7 @@ create table fave (
 
     constraint primary key (notice_id, user_id),
     index fave_notice_id_idx (notice_id),
-    index fave_user_id_idx (user_id),
+    index fave_user_id_idx (user_id,modified),
     index fave_modified_idx (modified)
 
 ) ENGINE=InnoDB CHARACTER SET utf8 COLLATE utf8_bin;
diff --git a/db/statusnet_pg.sql b/db/statusnet_pg.sql
index 0e5e96c327..392a6a5f3c 100644
--- a/db/statusnet_pg.sql
+++ b/db/statusnet_pg.sql
@@ -115,8 +115,8 @@ create table subscription (
 
     primary key (subscriber, subscribed)
 );
-create index subscription_subscriber_idx on subscription using btree(subscriber);
-create index subscription_subscribed_idx on subscription using btree(subscribed);
+create index subscription_subscriber_idx on subscription using btree(subscriber,created);
+create index subscription_subscribed_idx on subscription using btree(subscribed,created);
 
 create sequence notice_seq;
 create table notice (
@@ -171,7 +171,7 @@ create table fave (
 
 );
 create index fave_notice_id_idx on fave using btree(notice_id);
-create index fave_user_id_idx on fave using btree(user_id);
+create index fave_user_id_idx on fave using btree(user_id,modified);
 create index fave_modified_idx on fave using btree(modified);
 
 /* tables for OAuth */
diff --git a/lib/accountsettingsaction.php b/lib/accountsettingsaction.php
index a004a3ed99..9865e17489 100644
--- a/lib/accountsettingsaction.php
+++ b/lib/accountsettingsaction.php
@@ -102,26 +102,31 @@ class AccountSettingsNav extends Widget
         $this->action->elementStart('ul', array('class' => 'nav'));
 
         if (Event::handle('StartAccountSettingsNav', array(&$this->action))) {
+            $user = common_current_user();
 
-            $menu =
-              array('profilesettings' =>
+            $menu = array();
+            $menu['profilesettings'] =
                     array(_('Profile'),
-                          _('Change your profile settings')),
-                    'avatarsettings' =>
-                    array(_('Avatar'),
-                          _('Upload an avatar')),
-                    'passwordsettings' =>
-                    array(_('Password'),
-                          _('Change your password')),
-                    'emailsettings' =>
+                          _('Change your profile settings'));
+            if(Event::handle('CanUserChangeField', array($user->nickname, 'avatar'))){
+                $menu['avatarsettings'] =
+                        array(_('Avatar'),
+                              _('Upload an avatar'));
+            }
+            if(Event::handle('CanUserChangeField', array($user->nickname, 'password'))){
+                $menu['passwordsettings'] =
+                        array(_('Password'),
+                              _('Change your password'));
+            }
+            $menu['emailsettings'] =
                     array(_('Email'),
-                          _('Change email handling')),
-                    'userdesignsettings' =>
+                          _('Change email handling'));
+            $menu['userdesignsettings'] =
                     array(_('Design'),
-                          _('Design your profile')),
-                    'othersettings' =>
+                          _('Design your profile'));
+            $menu['othersettings'] =
                     array(_('Other'),
-                          _('Other options')));
+                          _('Other options'));
 
             foreach ($menu as $menuaction => $menudesc) {
                 $this->action->menuItem(common_local_url($menuaction),
diff --git a/lib/api.php b/lib/api.php
index fb4c4289b4..a1236ab7ec 100644
--- a/lib/api.php
+++ b/lib/api.php
@@ -66,7 +66,7 @@ class ApiAction extends Action
      *
      * @param array $args Web and URL arguments
      *
-     * @return boolean false if user does not exist
+     * @return boolean false if user doesn't exist
      */
 
     function prepare($args)
@@ -138,7 +138,7 @@ class ApiAction extends Action
         $design        = null;
         $user          = $profile->getUser();
 
-        // Note: some profiles do not have an associated user
+        // Note: some profiles don't have an associated user
 
         if (!empty($user)) {
             $design = $user->getDesign();
@@ -203,7 +203,7 @@ class ApiAction extends Action
         if ($get_notice) {
             $notice = $profile->getCurrentNotice();
             if ($notice) {
-                # do not get user!
+                # don't get user!
                 $twitter_user['status'] = $this->twitterStatusArray($notice, false);
             }
         }
@@ -263,7 +263,7 @@ class ApiAction extends Action
         }
 
         if ($include_user) {
-            # Do not get notice (recursive!)
+            # Don't get notice (recursive!)
             $twitter_user = $this->twitterUserArray($profile, false);
             $twitter_status['user'] = $twitter_user;
         }
@@ -1074,7 +1074,7 @@ class ApiAction extends Action
     function initTwitterAtom()
     {
         $this->startXML();
-        // FIXME: do not hardcode the language here!
+        // FIXME: don't hardcode the language here!
         $this->elementStart('feed', array('xmlns' => 'http://www.w3.org/2005/Atom',
                                           'xml:lang' => 'en-US',
                                           'xmlns:thr' => 'http://purl.org/syndication/thread/1.0'));
@@ -1116,7 +1116,7 @@ class ApiAction extends Action
                 return User::staticGet('nickname', $nickname);
             } else if ($this->arg('user_id')) {
                 // This is to ensure that a non-numeric user_id still
-                // overrides screen_name even if it does not get used
+                // overrides screen_name even if it doesn't get used
                 if (is_numeric($this->arg('user_id'))) {
                     return User::staticGet('id', $this->arg('user_id'));
                 }
@@ -1146,7 +1146,7 @@ class ApiAction extends Action
                 return User_group::staticGet('nickname', $nickname);
             } else if ($this->arg('group_id')) {
                 // This is to ensure that a non-numeric user_id still
-                // overrides screen_name even if it does not get used
+                // overrides screen_name even if it doesn't get used
                 if (is_numeric($this->arg('group_id'))) {
                     return User_group::staticGet('id', $this->arg('group_id'));
                 }
diff --git a/lib/apiauth.php b/lib/apiauth.php
index b8189f15dd..2f2e44a264 100644
--- a/lib/apiauth.php
+++ b/lib/apiauth.php
@@ -87,7 +87,7 @@ class ApiAuthAction extends ApiAction
     }
 
     /**
-     * Check for a user specified via HTTP basic auth. If there is not
+     * Check for a user specified via HTTP basic auth. If there isn't
      * one, try to get one by outputting the basic auth header.
      *
      * @return boolean true or false
diff --git a/lib/dberroraction.php b/lib/dberroraction.php
index 893797b70e..2cb66a022d 100644
--- a/lib/dberroraction.php
+++ b/lib/dberroraction.php
@@ -39,7 +39,7 @@ require_once INSTALLDIR.'/lib/servererroraction.php';
  *
  * This only occurs if there's been a DB_DataObject_Error that's
  * reported through PEAR, so we try to avoid doing anything that connects
- * to the DB, so we do not trigger it again.
+ * to the DB, so we don't trigger it again.
  *
  * @category Action
  * @package  StatusNet
@@ -62,12 +62,12 @@ class DBErrorAction extends ServerErrorAction
 
     function getLanguage()
     {
-        // Do not try to figure out user's language; just show the page
+        // Don't try to figure out user's language; just show the page
         return common_config('site', 'language');
     }
 
     function showPrimaryNav()
     {
-        // do not show primary nav
+        // don't show primary nav
     }
 }
diff --git a/lib/error.php b/lib/error.php
index 5ed5dec1bd..3162cfe656 100644
--- a/lib/error.php
+++ b/lib/error.php
@@ -104,11 +104,11 @@ class ErrorAction extends Action
     {
         parent::showPage();
 
-        // We do not want to have any more output after this
+        // We don't want to have any more output after this
         exit();
     }
 
-    // Overload a bunch of stuff so the page is not too bloated
+    // Overload a bunch of stuff so the page isn't too bloated
 
     function showBody()
     {
diff --git a/lib/groupnav.php b/lib/groupnav.php
index 31cf378c8a..131b38fa27 100644
--- a/lib/groupnav.php
+++ b/lib/groupnav.php
@@ -79,46 +79,49 @@ class GroupNav extends Widget
         $nickname = $this->group->nickname;
 
         $this->out->elementStart('ul', array('class' => 'nav'));
-        $this->out->menuItem(common_local_url('showgroup', array('nickname' =>
-                                                                 $nickname)),
-                             _('Group'),
-                             sprintf(_('%s group'), $nickname),
-                             $action_name == 'showgroup',
-                             'nav_group_group');
-        $this->out->menuItem(common_local_url('groupmembers', array('nickname' =>
-                                                                    $nickname)),
-                             _('Members'),
-                             sprintf(_('%s group members'), $nickname),
-                             $action_name == 'groupmembers',
-                             'nav_group_members');
-
-        $cur = common_current_user();
-
-        if ($cur && $cur->isAdmin($this->group)) {
-            $this->out->menuItem(common_local_url('blockedfromgroup', array('nickname' =>
-                                                                            $nickname)),
-                                 _('Blocked'),
-                                 sprintf(_('%s blocked users'), $nickname),
-                                 $action_name == 'blockedfromgroup',
-                                 'nav_group_blocked');
-            $this->out->menuItem(common_local_url('editgroup', array('nickname' =>
+        if (Event::handle('StartGroupGroupNav', array($this))) {
+            $this->out->menuItem(common_local_url('showgroup', array('nickname' =>
                                                                      $nickname)),
-                                 _('Admin'),
-                                 sprintf(_('Edit %s group properties'), $nickname),
-                                 $action_name == 'editgroup',
-                                 'nav_group_admin');
-            $this->out->menuItem(common_local_url('grouplogo', array('nickname' =>
-                                                                     $nickname)),
-                                 _('Logo'),
-                                 sprintf(_('Add or edit %s logo'), $nickname),
-                                 $action_name == 'grouplogo',
-                                 'nav_group_logo');
-            $this->out->menuItem(common_local_url('groupdesignsettings', array('nickname' =>
-                                                                  $nickname)),
-                                 _('Design'),
-                                 sprintf(_('Add or edit %s design'), $nickname),
-                                 $action_name == 'groupdesignsettings',
-                                 'nav_group_design');
+                                 _('Group'),
+                                 sprintf(_('%s group'), $nickname),
+                                 $action_name == 'showgroup',
+                                 'nav_group_group');
+            $this->out->menuItem(common_local_url('groupmembers', array('nickname' =>
+                                                                        $nickname)),
+                                 _('Members'),
+                                 sprintf(_('%s group members'), $nickname),
+                                 $action_name == 'groupmembers',
+                                 'nav_group_members');
+
+            $cur = common_current_user();
+
+            if ($cur && $cur->isAdmin($this->group)) {
+                $this->out->menuItem(common_local_url('blockedfromgroup', array('nickname' =>
+                                                                                $nickname)),
+                                     _('Blocked'),
+                                     sprintf(_('%s blocked users'), $nickname),
+                                     $action_name == 'blockedfromgroup',
+                                     'nav_group_blocked');
+                $this->out->menuItem(common_local_url('editgroup', array('nickname' =>
+                                                                         $nickname)),
+                                     _('Admin'),
+                                     sprintf(_('Edit %s group properties'), $nickname),
+                                     $action_name == 'editgroup',
+                                     'nav_group_admin');
+                $this->out->menuItem(common_local_url('grouplogo', array('nickname' =>
+                                                                         $nickname)),
+                                     _('Logo'),
+                                     sprintf(_('Add or edit %s logo'), $nickname),
+                                     $action_name == 'grouplogo',
+                                     'nav_group_logo');
+                $this->out->menuItem(common_local_url('groupdesignsettings', array('nickname' =>
+                                                                      $nickname)),
+                                     _('Design'),
+                                     sprintf(_('Add or edit %s design'), $nickname),
+                                     $action_name == 'groupdesignsettings',
+                                     'nav_group_design');
+            }
+            Event::handle('EndGroupGroupNav', array($this));
         }
         $this->out->elementEnd('ul');
     }
diff --git a/lib/htmloutputter.php b/lib/htmloutputter.php
index 73bd9ce815..c2ec83c284 100644
--- a/lib/htmloutputter.php
+++ b/lib/htmloutputter.php
@@ -76,7 +76,7 @@ class HTMLOutputter extends XMLOutputter
     /**
      * Start an HTML document
      *
-     * If $type is not specified, will attempt to do content negotiation.
+     * If $type isn't specified, will attempt to do content negotiation.
      *
      * Attempts to do content negotiation for language, also.
      *
diff --git a/lib/imagefile.php b/lib/imagefile.php
index edc7218d03..cf1668f203 100644
--- a/lib/imagefile.php
+++ b/lib/imagefile.php
@@ -119,7 +119,7 @@ class ImageFile
             return;
         }
 
-        // Do not crop/scale if it is not necessary
+        // Don't crop/scale if it isn't necessary
         if ($size === $this->width
             && $size === $this->height
             && $x === 0
diff --git a/lib/jabber.php b/lib/jabber.php
index d666fcbb38..73f2ec6605 100644
--- a/lib/jabber.php
+++ b/lib/jabber.php
@@ -437,7 +437,7 @@ function jabber_public_notice($notice)
 
     $public = common_config('xmpp', 'public');
 
-    // FIXME PRIV do not send out private messages here
+    // FIXME PRIV don't send out private messages here
     // XXX: should we send out non-local messages if public,localonly
     // = false? I think not
 
diff --git a/lib/mail.php b/lib/mail.php
index 79630b721c..5218059e9d 100644
--- a/lib/mail.php
+++ b/lib/mail.php
@@ -467,7 +467,7 @@ function mail_notify_nudge($from, $to)
                       "these days and is inviting you to post some news.\n\n".
                       "So let's hear from you :)\n\n".
                       "%3\$s\n\n".
-                      "Do not reply to this email. It will not get to them.\n\n".
+                      "Don't reply to this email; it won't get to them.\n\n".
                       "With kind regards,\n".
                       "%4\$s\n"),
                     $from_profile->getBestName(),
@@ -516,7 +516,7 @@ function mail_notify_message($message, $from=null, $to=null)
                       "------------------------------------------------------\n\n".
                       "You can reply to their message here:\n\n".
                       "%4\$s\n\n".
-                      "Do not reply to this email. It will not get to them.\n\n".
+                      "Don't reply to this email; it won't get to them.\n\n".
                       "With kind regards,\n".
                       "%5\$s\n"),
                     $from_profile->getBestName(),
@@ -532,7 +532,7 @@ function mail_notify_message($message, $from=null, $to=null)
 /**
  * notify a user that one of their notices has been chosen as a 'fave'
  *
- * Does not check that the user has an email address nor if they
+ * Doesn't check that the user has an email address nor if they
  * want to receive notification of faves. Maybe this happens higher
  * up the stack...?
  *
diff --git a/lib/noticelist.php b/lib/noticelist.php
index 4e5623ded6..bf12bb73c5 100644
--- a/lib/noticelist.php
+++ b/lib/noticelist.php
@@ -347,7 +347,7 @@ class NoticeListItem extends Widget
      * show the link to the main page for the notice
      *
      * Displays a link to the page for a notice, with "relative" time. Tries to
-     * get remote notice URLs correct, but does not always succeed.
+     * get remote notice URLs correct, but doesn't always succeed.
      *
      * @return void
      */
@@ -483,7 +483,7 @@ class NoticeListItem extends Widget
      * show a link to reply to the current notice
      *
      * Should either do the reply in the current notice form (if available), or
-     * link out to the notice-posting form. A little flakey, does not always work.
+     * link out to the notice-posting form. A little flakey, doesn't always work.
      *
      * @return void
      */
diff --git a/lib/queuehandler.php b/lib/queuehandler.php
index 7c07ca4f99..cd43b1e09a 100644
--- a/lib/queuehandler.php
+++ b/lib/queuehandler.php
@@ -96,8 +96,8 @@ class QueueHandler extends Daemon
      * Initialization, run when the queue handler starts.
      * If this function indicates failure, the handler run will be aborted.
      *
-     * @fixme run() will abort if this does not return true,
-     *        but some subclasses do not bother.
+     * @fixme run() will abort if this doesn't return true,
+     *        but some subclasses don't bother.
      * @return boolean true on success, false on failure
      */
     function start()
@@ -108,8 +108,8 @@ class QueueHandler extends Daemon
      * Cleanup, run when the queue handler ends.
      * If this function indicates failure, a warning will be logged.
      *
-     * @fixme run() will throw warnings if this does not return true,
-     *        but many subclasses do not bother.
+     * @fixme run() will throw warnings if this doesn't return true,
+     *        but many subclasses don't bother.
      * @return boolean true on success, false on failure
      */
     function finish()
@@ -137,7 +137,7 @@ class QueueHandler extends Daemon
      * method, which passes control back to our handle_notice() method for
      * each notice that comes in on the queue.
      *
-     * Most of the time this will not need to be overridden in a subclass.
+     * Most of the time this won't need to be overridden in a subclass.
      *
      * @return boolean true on success, false on failure
      */
@@ -173,7 +173,7 @@ class QueueHandler extends Daemon
      * Called by QueueHandler after each handled item or empty polling cycle.
      * This is a good time to e.g. service your XMPP connection.
      *
-     * Does not need to be overridden if there's no maintenance to do.
+     * Doesn't need to be overridden if there's no maintenance to do.
      *
      * @param int $timeout seconds to sleep if there's nothing to do
      */
diff --git a/lib/rssaction.php b/lib/rssaction.php
index 0e84a65e92..faf6bec7de 100644
--- a/lib/rssaction.php
+++ b/lib/rssaction.php
@@ -386,7 +386,7 @@ class Rss10Action extends Action
             return null;
         }
 
-        // FIXME: does not handle modified profiles, avatars, deleted notices
+        // FIXME: doesn't handle modified profiles, avatars, deleted notices
 
         return strtotime($this->notices[0]->created);
     }
diff --git a/lib/search_engines.php b/lib/search_engines.php
index 82713235c9..69f6ff468e 100644
--- a/lib/search_engines.php
+++ b/lib/search_engines.php
@@ -119,7 +119,7 @@ class MySQLSearch extends SearchEngine
             return true;
         } else if ('identica_notices' === $this->table) {
 
-            // Do not show imported notices
+            // Don't show imported notices
             $this->target->whereAdd('notice.is_local != ' . Notice::GATEWAY);
 
             if (strtolower($q) != $q) {
diff --git a/lib/util.php b/lib/util.php
index 0ed0688eb5..65bc6544da 100644
--- a/lib/util.php
+++ b/lib/util.php
@@ -61,7 +61,6 @@ function common_init_language()
     $language = common_language();
     $locale_set = common_init_locale($language);
     setlocale(LC_CTYPE, 'C');
-
     // So we do not have to make people install the gettext locales
     $path = common_config('site','locale_path');
     bindtextdomain("statusnet", $path);
@@ -139,7 +138,7 @@ function common_check_user($nickname, $password)
                 }
             }
         }else{
-            //no handler indicated the credentials were valid, and we know their not valid because the user is not in the database
+            //no handler indicated the credentials were valid, and we know their not valid because the user isn't in the database
             return false;
         }
     } else {
@@ -396,7 +395,7 @@ function common_current_user()
 }
 
 // Logins that are 'remembered' aren't 'real' -- they're subject to
-// cookie-stealing. So, we do not let them do certain things. New reg,
+// cookie-stealing. So, we don't let them do certain things. New reg,
 // OpenID, and password logins _are_ real.
 
 function common_real_login($real=true)
@@ -1151,7 +1150,7 @@ function common_accept_to_prefs($accept, $def = '*/*')
     $parts = explode(',', $accept);
 
     foreach($parts as $part) {
-        // FIXME: does not deal with params like 'text/html; level=1'
+        // FIXME: doesn't deal with params like 'text/html; level=1'
         @list($value, $qpart) = explode(';', trim($part));
         $match = array();
         if(!isset($qpart)) {
@@ -1350,7 +1349,7 @@ function common_error_handler($errno, $errstr, $errfile, $errline, $errcontext)
     }
 
     // FIXME: show error page if we're on the Web
-    /* Do not execute PHP internal error handler */
+    /* Don't execute PHP internal error handler */
     return true;
 }
 
@@ -1452,7 +1451,7 @@ function common_shorten_url($long_url)
     }
     global $_shorteners;
     if (!isset($_shorteners[$svc])) {
-        //the user selected service does not exist, so default to ur1.ca
+        //the user selected service doesn't exist, so default to ur1.ca
         $svc = 'ur1.ca';
     }
     if (!isset($_shorteners[$svc])) {
diff --git a/lib/xmloutputter.php b/lib/xmloutputter.php
index 9d862b2d02..5f06e491df 100644
--- a/lib/xmloutputter.php
+++ b/lib/xmloutputter.php
@@ -112,7 +112,7 @@ class XMLOutputter
      *
      * Utility for outputting an XML element. A convenient wrapper
      * for a bunch of longer XMLWriter calls. This is best for
-     * when an element does not have any sub-elements; if that's the
+     * when an element doesn't have any sub-elements; if that's the
      * case, use elementStart() and elementEnd() instead.
      *
      * The $content element will be escaped for XML. If you need
diff --git a/lib/xmppqueuehandler.php b/lib/xmppqueuehandler.php
index 7caa078ae3..f28fc9088c 100644
--- a/lib/xmppqueuehandler.php
+++ b/lib/xmppqueuehandler.php
@@ -37,7 +37,7 @@ class XmppQueueHandler extends QueueHandler
 
     function start()
     {
-        # Low priority; we do not want to receive messages
+        # Low priority; we don't want to receive messages
 
         $this->log(LOG_INFO, "INITIALIZE");
         $this->conn = jabber_connect($this->_id.$this->transport());
diff --git a/plugins/Autocomplete/autocomplete.php b/plugins/Autocomplete/autocomplete.php
index aeb100cfa4..379390ffdf 100644
--- a/plugins/Autocomplete/autocomplete.php
+++ b/plugins/Autocomplete/autocomplete.php
@@ -79,7 +79,7 @@ class AutocompleteAction extends Action
     function etag()
     {
         return '"' . implode(':', array($this->arg('action'),
-            crc32($this->arg('q')), //the actual string can have funny characters in we do not want showing up in the etag
+            crc32($this->arg('q')), //the actual string can have funny characters in we don't want showing up in the etag
             $this->arg('limit'),
             $this->lastModified())) . '"';
     }
diff --git a/plugins/BlogspamNetPlugin.php b/plugins/BlogspamNetPlugin.php
index bf60fdcaf0..51236001aa 100644
--- a/plugins/BlogspamNetPlugin.php
+++ b/plugins/BlogspamNetPlugin.php
@@ -85,7 +85,7 @@ class BlogspamNetPlugin extends Plugin
             } else if (preg_match('/^SPAM(:(.*))?$/', $response, $match)) {
                 throw new ClientException(sprintf(_("Spam checker results: %s"), $match[2]), 400);
             } else if (preg_match('/^OK$/', $response)) {
-                // do not do anything
+                // don't do anything
             } else {
                 throw new ServerException(sprintf(_("Unexpected response from %s: %s"), $this->baseUrl, $response), 500);
             }
diff --git a/plugins/Facebook/FBConnectAuth.php b/plugins/Facebook/FBConnectAuth.php
index 165477419a..b909a49771 100644
--- a/plugins/Facebook/FBConnectAuth.php
+++ b/plugins/Facebook/FBConnectAuth.php
@@ -71,7 +71,7 @@ class FBConnectauthAction extends Action
                              'There is already a local user (' . $flink->user_id .
                              ') linked with this Facebook (' . $this->fbuid . ').');
 
-                // We do not want these cookies
+                // We don't want these cookies
                 getFacebook()->clear_cookie_state();
 
                 $this->clientError(_('There is already a local user linked with this Facebook.'));
@@ -364,7 +364,7 @@ class FBConnectauthAction extends Action
     {
         $url = common_get_returnto();
         if ($url) {
-            // We do not have to return to it again
+            // We don't have to return to it again
             common_set_returnto(null);
         } else {
             $url = common_local_url('all',
diff --git a/plugins/Facebook/FacebookPlugin.php b/plugins/Facebook/FacebookPlugin.php
index cd1ad7b45e..b68534b24f 100644
--- a/plugins/Facebook/FacebookPlugin.php
+++ b/plugins/Facebook/FacebookPlugin.php
@@ -182,7 +182,7 @@ class FacebookPlugin extends Plugin
             $login_url  = common_local_url('FBConnectAuth');
             $logout_url = common_local_url('logout');
 
-            // XXX: Facebook says we do not need this FB_RequireFeatures(),
+            // XXX: Facebook says we don't need this FB_RequireFeatures(),
             // but we actually do, for IE and Safari. Gar.
 
             $js  = '<script type="text/javascript">';
@@ -201,7 +201,7 @@ class FacebookPlugin extends Plugin
             // The below function alters the logout link so that it logs the user out
             // of Facebook Connect as well as the site.  However, for some pages
             // (FB Connect Settings) we need to output the FB Connect scripts (to
-            // show an existing FB connection even if the user is not authenticated
+            // show an existing FB connection even if the user isn't authenticated
             // with Facebook connect) but NOT alter the logout link. And the only
             // way to reliably do that is with the FB Connect .js libs.  Crazy.
 
diff --git a/plugins/Facebook/facebook/facebook.php b/plugins/Facebook/facebook/facebook.php
index 7b01077882..016e8e8e0d 100644
--- a/plugins/Facebook/facebook/facebook.php
+++ b/plugins/Facebook/facebook/facebook.php
@@ -57,7 +57,7 @@ class Facebook {
    * @param api_key                  your Developer API key
    * @param secret                   your Developer API secret
    * @param generate_session_secret  whether to automatically generate a session
-   *                                 if the user does not have one, but
+   *                                 if the user doesn't have one, but
    *                                 there is an auth token present in the url,
    */
   public function __construct($api_key, $secret, $generate_session_secret=false) {
@@ -192,7 +192,7 @@ class Facebook {
       }
       return $session_secret;
     } catch (FacebookRestClientException $e) {
-      // API_EC_PARAM means we do not have a logged in user, otherwise who
+      // API_EC_PARAM means we don't have a logged in user, otherwise who
       // knows what it means, so just throw it.
       if ($e->getCode() != FacebookAPIErrorCodes::API_EC_PARAM) {
         throw $e;
@@ -204,7 +204,7 @@ class Facebook {
     try {
       return $this->api_client->auth_getSession($auth_token, $this->generate_session_secret);
     } catch (FacebookRestClientException $e) {
-      // API_EC_PARAM means we do not have a logged in user, otherwise who
+      // API_EC_PARAM means we don't have a logged in user, otherwise who
       // knows what it means, so just throw it.
       if ($e->getCode() != FacebookAPIErrorCodes::API_EC_PARAM) {
         throw $e;
@@ -265,7 +265,7 @@ class Facebook {
     if ($this->in_fb_canvas()) {
       echo '<fb:redirect url="' . $url . '"/>';
     } else if (preg_match('/^https?:\/\/([^\/]*\.)?facebook\.com(:\d+)?/i', $url)) {
-      // make sure facebook.com url's load in the full frame so that we do not
+      // make sure facebook.com url's load in the full frame so that we don't
       // get a frame within a frame.
       echo "<script type=\"text/javascript\">\ntop.location.href = \"$url\";\n</script>";
     } else {
diff --git a/plugins/Facebook/facebook/facebook_desktop.php b/plugins/Facebook/facebook/facebook_desktop.php
index 425bb5c7bd..e79a2ca343 100644
--- a/plugins/Facebook/facebook/facebook_desktop.php
+++ b/plugins/Facebook/facebook/facebook_desktop.php
@@ -93,7 +93,7 @@ class FacebookDesktop extends Facebook {
   }
 
   public function verify_signature($fb_params, $expected_sig) {
-    // we do not want to verify the signature until we have a valid
+    // we don't want to verify the signature until we have a valid
     // session secret
     if ($this->verify_sig) {
       return parent::verify_signature($fb_params, $expected_sig);
diff --git a/plugins/Facebook/facebook/facebookapi_php5_restlib.php b/plugins/Facebook/facebook/facebookapi_php5_restlib.php
index c742df7480..55cb7fb86a 100755
--- a/plugins/Facebook/facebook/facebookapi_php5_restlib.php
+++ b/plugins/Facebook/facebook/facebookapi_php5_restlib.php
@@ -46,7 +46,7 @@ class FacebookRestClient {
   // on canvas pages
   public $added;
   public $is_user;
-  // we do not pass friends list to iframes, but we want to make
+  // we don't pass friends list to iframes, but we want to make
   // friends_get really simple in the canvas_user (non-logged in) case.
   // So we use the canvas_user as default arg to friends_get
   public $canvas_user;
@@ -657,7 +657,7 @@ function toggleDisplay(id, type) {
    * deleted.
    *
    * IMPORTANT: If your application has registered public tags
-   * that other applications may be using, do not delete those tags!
+   * that other applications may be using, don't delete those tags!
    * Doing so can break the FBML ofapplications that are using them.
    *
    * @param array $tag_names the names of the tags to delete (optinal)
@@ -820,7 +820,7 @@ function toggleDisplay(id, type) {
 
     if (is_array($target_ids)) {
       $target_ids = json_encode($target_ids);
-      $target_ids = trim($target_ids, "[]"); // we do not want square brackets
+      $target_ids = trim($target_ids, "[]"); // we don't want square brackets
     }
 
     return $this->call_method('facebook.feed.publishUserAction',
diff --git a/plugins/Facebook/facebook/jsonwrapper/jsonwrapper.php b/plugins/Facebook/facebook/jsonwrapper/jsonwrapper.php
index 9c6c626632..29509debad 100644
--- a/plugins/Facebook/facebook/jsonwrapper/jsonwrapper.php
+++ b/plugins/Facebook/facebook/jsonwrapper/jsonwrapper.php
@@ -1,5 +1,5 @@
 <?php
-# In PHP 5.2 or higher we do not need to bring this in
+# In PHP 5.2 or higher we don't need to bring this in
 if (!function_exists('json_encode')) {
 	require_once 'jsonwrapper_inner.php';
 } 
diff --git a/plugins/Facebook/facebookaction.php b/plugins/Facebook/facebookaction.php
index 2327694e43..a10fdf90d4 100644
--- a/plugins/Facebook/facebookaction.php
+++ b/plugins/Facebook/facebookaction.php
@@ -95,7 +95,7 @@ class FacebookAction extends Action
     /**
      * Start an Facebook ready HTML document
      *
-     * For Facebook we do not want to actually output any headers,
+     * For Facebook we don't want to actually output any headers,
      * DTD info, etc.  Just Stylesheet and JavaScript links.
      *
      * @param string $type MIME type to use; default is to do negotation.
@@ -129,7 +129,7 @@ class FacebookAction extends Action
      */
     function showNoticeForm()
     {
-        // do not do it for most of the Facebook pages
+        // don't do it for most of the Facebook pages
     }
 
     function showBody()
@@ -581,7 +581,7 @@ class FacebookNoticeListItem extends NoticeListItem
     /**
      * recipe function for displaying a single notice in the Facebook App.
      *
-     * Overridden to strip out some of the controls that we do not
+     * Overridden to strip out some of the controls that we don't
      * want to be available.
      *
      * @return void
diff --git a/plugins/GeonamesPlugin.php b/plugins/GeonamesPlugin.php
index 8059d49d78..e18957c36d 100644
--- a/plugins/GeonamesPlugin.php
+++ b/plugins/GeonamesPlugin.php
@@ -87,12 +87,12 @@ class GeonamesPlugin extends Plugin
                 $location->location_id      = $n->geonameId;
                 $location->location_ns      = self::NAMESPACE;
 
-                // handled, do not continue processing!
+                // handled, don't continue processing!
                 return false;
             }
         }
 
-        // Continue processing; we do not have the answer
+        // Continue processing; we don't have the answer
         return true;
     }
 
@@ -217,7 +217,7 @@ class GeonamesPlugin extends Plugin
             }
         }
 
-        // For some reason we do not know, so pass.
+        // For some reason we don't know, so pass.
 
         return true;
     }
@@ -299,7 +299,7 @@ class GeonamesPlugin extends Plugin
 
         $url = 'http://www.geonames.org/' . $location->location_id;
 
-        // it's been filled, so do not process further.
+        // it's been filled, so don't process further.
         return false;
     }
 }
diff --git a/plugins/Ldap/LdapPlugin.php b/plugins/Ldap/LdapPlugin.php
index 755562f54b..3795ffd7f1 100644
--- a/plugins/Ldap/LdapPlugin.php
+++ b/plugins/Ldap/LdapPlugin.php
@@ -102,4 +102,15 @@ class LdapPlugin extends Plugin
         //return false, indicating that the event has been handled
         return false;
     }
+
+    function onCanUserChangeField($nickname, $field)
+    {
+        switch($field)
+        {
+            case 'password':
+            case 'nickname':
+            case 'email':
+                return false;
+        }
+    }
 }
diff --git a/plugins/OpenID/finishopenidlogin.php b/plugins/OpenID/finishopenidlogin.php
index b5d9782945..ff0b451d30 100644
--- a/plugins/OpenID/finishopenidlogin.php
+++ b/plugins/OpenID/finishopenidlogin.php
@@ -341,7 +341,7 @@ class FinishopenidloginAction extends Action
     {
         $url = common_get_returnto();
         if ($url) {
-            # We do not have to return to it again
+            # We don't have to return to it again
             common_set_returnto(null);
         } else {
             $url = common_local_url('all',
@@ -421,7 +421,7 @@ class FinishopenidloginAction extends Action
 
         $parts = parse_url($openid);
 
-        # If any of these parts exist, this will not work
+        # If any of these parts exist, this won't work
 
         foreach ($bad as $badpart) {
             if (array_key_exists($badpart, $parts)) {
diff --git a/plugins/OpenID/openid.php b/plugins/OpenID/openid.php
index c5f6d17132..ff7a938994 100644
--- a/plugins/OpenID/openid.php
+++ b/plugins/OpenID/openid.php
@@ -187,7 +187,7 @@ function oid_authenticate($openid_url, $returnto, $immediate=false)
         $form_html = $auth_request->formMarkup($trust_root, $process_url,
                                                $immediate, array('id' => $form_id));
 
-        # XXX: This is cheap, but things choke if we do not escape ampersands
+        # XXX: This is cheap, but things choke if we don't escape ampersands
         # in the HTML attributes
 
         $form_html = preg_replace('/&/', '&amp;', $form_html);
diff --git a/plugins/PiwikAnalyticsPlugin.php b/plugins/PiwikAnalyticsPlugin.php
index 81ef7c6837..54faa0bdbe 100644
--- a/plugins/PiwikAnalyticsPlugin.php
+++ b/plugins/PiwikAnalyticsPlugin.php
@@ -44,7 +44,7 @@ if (!defined('STATUSNET')) {
  *                                    'piwikId' => 'id'));
  *
  * Replace 'example.com/piwik/' with the URL to your Piwik installation and
- * make sure you do not forget the final /.
+ * make sure you don't forget the final /.
  * Replace 'id' with the ID your statusnet installation has in your Piwik
  * analytics setup - for example '8'.
  *
diff --git a/plugins/Realtime/RealtimePlugin.php b/plugins/Realtime/RealtimePlugin.php
index 88a87dcf9c..0c7c1240c3 100644
--- a/plugins/Realtime/RealtimePlugin.php
+++ b/plugins/Realtime/RealtimePlugin.php
@@ -240,7 +240,7 @@ class RealtimePlugin extends Plugin
         // FIXME: this code should be abstracted to a neutral third
         // party, like Notice::asJson(). I'm not sure of the ethics
         // of refactoring from within a plugin, so I'm just abusing
-        // the ApiAction method. Do not do this unless you're me!
+        // the ApiAction method. Don't do this unless you're me!
 
         require_once(INSTALLDIR.'/lib/api.php');
 
diff --git a/plugins/TwitterBridge/daemons/synctwitterfriends.php b/plugins/TwitterBridge/daemons/synctwitterfriends.php
index c89c02eedb..671e3c7afa 100755
--- a/plugins/TwitterBridge/daemons/synctwitterfriends.php
+++ b/plugins/TwitterBridge/daemons/synctwitterfriends.php
@@ -115,7 +115,7 @@ class SyncTwitterFriendsDaemon extends ParallelizingDaemon
         // Each child ps needs its own DB connection
 
         // Note: DataObject::getDatabaseConnection() creates
-        // a new connection if there is not one already
+        // a new connection if there isn't one already
 
         $conn = &$flink->getDatabaseConnection();
 
diff --git a/plugins/TwitterBridge/daemons/twitterstatusfetcher.php b/plugins/TwitterBridge/daemons/twitterstatusfetcher.php
index 25df0d8396..b5428316bd 100755
--- a/plugins/TwitterBridge/daemons/twitterstatusfetcher.php
+++ b/plugins/TwitterBridge/daemons/twitterstatusfetcher.php
@@ -136,7 +136,7 @@ class TwitterStatusFetcher extends ParallelizingDaemon
         // Each child ps needs its own DB connection
 
         // Note: DataObject::getDatabaseConnection() creates
-        // a new connection if there is not one already
+        // a new connection if there isn't one already
 
         $conn = &$flink->getDatabaseConnection();
 
@@ -499,7 +499,7 @@ class TwitterStatusFetcher extends ParallelizingDaemon
             $avatar->height = 73;
         }
 
-        $avatar->original = 0; // we do not have the original
+        $avatar->original = 0; // we don't have the original
         $avatar->mediatype = $mediatype;
         $avatar->filename = $filename;
         $avatar->url = Avatar::url($filename);
diff --git a/plugins/TwitterBridge/twitter.php b/plugins/TwitterBridge/twitter.php
index d48089caa2..3c6803e49a 100644
--- a/plugins/TwitterBridge/twitter.php
+++ b/plugins/TwitterBridge/twitter.php
@@ -33,7 +33,7 @@ function updateTwitter_user($twitter_id, $screen_name)
 
     $fuser->query('BEGIN');
 
-    // Dropping down to SQL because regular DB_DataObject udpate stuff does not seem
+    // Dropping down to SQL because regular DB_DataObject udpate stuff doesn't seem
     // to work so good with tables that have multiple column primary keys
 
     // Any time we update the uri for a forein user we have to make sure there
diff --git a/scripts/console.php b/scripts/console.php
index 2a000d39b0..41dd43f281 100755
--- a/scripts/console.php
+++ b/scripts/console.php
@@ -60,9 +60,9 @@ function read_input_line($prompt)
 }
 
 /**
- * On Unix-like systems where PHP readline extension is not present,
+ * On Unix-like systems where PHP readline extension isn't present,
  * -cough- Mac OS X -cough- we can shell out to bash to do it for us.
- * This lets us at least handle things like arrow keys, but we do not
+ * This lets us at least handle things like arrow keys, but we don't
  * get any entry history. :(
  *
  * Shamelessly ripped from when I wrote the same code for MediaWiki. :)
diff --git a/scripts/maildaemon.php b/scripts/maildaemon.php
index 4ec4526ef4..b4e4d9f08d 100755
--- a/scripts/maildaemon.php
+++ b/scripts/maildaemon.php
@@ -231,7 +231,7 @@ class MailerDaemon
         foreach ($parsed->parts as $part) {
             $this->extract_part($part,$msg,$attachments);
         }
-        //we do not want any attachments that are a result of this parsing
+        //we don't want any attachments that are a result of this parsing
         return $msg;
     }
 
diff --git a/scripts/xmppconfirmhandler.php b/scripts/xmppconfirmhandler.php
index f5f824dee2..c7ed15e495 100755
--- a/scripts/xmppconfirmhandler.php
+++ b/scripts/xmppconfirmhandler.php
@@ -69,7 +69,7 @@ class XmppConfirmHandler extends XmppQueueHandler
                     continue;
                 } else {
                     $this->log(LOG_INFO, 'Confirmation sent for ' . $confirm->address);
-                    # Mark confirmation sent; need a dupe so we do not have the WHERE clause
+                    # Mark confirmation sent; need a dupe so we don't have the WHERE clause
                     $dupe = Confirm_address::staticGet('code', $confirm->code);
                     if (!$dupe) {
                         common_log(LOG_WARNING, 'Could not refetch confirm', __FILE__);