diff --git a/actions/deletenotice.php b/actions/deletenotice.php
index 68c43040b0..2879faa5df 100644
--- a/actions/deletenotice.php
+++ b/actions/deletenotice.php
@@ -45,6 +45,12 @@ class DeletenoticeAction extends Action
         parent::prepare($args);
 
         $this->user   = common_current_user();
+
+        if (!$this->user) {
+            common_user_error(_('Not logged in.'));
+            exit;
+        }
+
         $notice_id    = $this->trimmed('notice');
         $this->notice = Notice::staticGet($notice_id);
 
@@ -63,10 +69,7 @@ class DeletenoticeAction extends Action
     {
         parent::handle($args);
 
-        if (!common_logged_in()) {
-            common_user_error(_('Not logged in.'));
-            exit;
-        } else if ($this->notice->profile_id != $this->user_profile->id &&
+        if ($this->notice->profile_id != $this->user_profile->id &&
                    !$this->user->hasRight(Right::DELETEOTHERSNOTICE)) {
             common_user_error(_('Can\'t delete this notice.'));
             exit;
diff --git a/plugins/Facebook/FBConnectAuth.php b/plugins/Facebook/FBConnectAuth.php
index f06dffaaab..d6d3786261 100644
--- a/plugins/Facebook/FBConnectAuth.php
+++ b/plugins/Facebook/FBConnectAuth.php
@@ -27,6 +27,10 @@
  * @link      http://status.net/
  */
 
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
 require_once INSTALLDIR . '/plugins/Facebook/FacebookPlugin.php';
 
 class FBConnectauthAction extends Action
diff --git a/plugins/Facebook/facebookremove.php b/plugins/Facebook/facebookremove.php
index b048a435f5..bc76daaef6 100644
--- a/plugins/Facebook/facebookremove.php
+++ b/plugins/Facebook/facebookremove.php
@@ -48,6 +48,12 @@ class FacebookremoveAction extends FacebookAction
 
             $flink = Foreign_link::getByForeignID($this->arg('fb_sig_user'), 2);
 
+            if (!$flink) {
+                common_log(LOG_ERR, "Tried to delete missing foreign_link entry with Facebook ID " . $this->arg('fb_sig_user'));
+                $this->serverError(_m('Couldn\'t remove Facebook user: already deleted.'));
+                return;
+            }
+
             common_debug("Removing foreign link to Facebook - local user ID: $flink->user_id, Facebook ID: $flink->foreign_id");
 
             $result = $flink->delete();
diff --git a/plugins/Facebook/facebookutil.php b/plugins/Facebook/facebookutil.php
index e78856f7c4..fb70c51bc5 100644
--- a/plugins/Facebook/facebookutil.php
+++ b/plugins/Facebook/facebookutil.php
@@ -17,6 +17,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
 require_once INSTALLDIR . '/plugins/Facebook/facebook/facebook.php';
 require_once INSTALLDIR . '/plugins/Facebook/facebookaction.php';
 require_once INSTALLDIR . '/lib/noticelist.php';
diff --git a/plugins/Imap/imapmailhandler.php b/plugins/Imap/imapmailhandler.php
index 3d4b6113a9..92abf64747 100644
--- a/plugins/Imap/imapmailhandler.php
+++ b/plugins/Imap/imapmailhandler.php
@@ -17,7 +17,9 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
+if (!defined('STATUSNET')) {
+    exit(1);
+}
 
 class IMAPMailHandler extends MailHandler
 {
diff --git a/plugins/Imap/imapmanager.php b/plugins/Imap/imapmanager.php
index e2f8c6d543..a9e531e1ae 100644
--- a/plugins/Imap/imapmanager.php
+++ b/plugins/Imap/imapmanager.php
@@ -29,6 +29,10 @@
  * @link      http://status.net/
  */
 
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
 class ImapManager extends IoManager
 {
     protected $conn = null;
diff --git a/plugins/OStatus/OStatusPlugin.php b/plugins/OStatus/OStatusPlugin.php
index 9c6696439a..4ab2023cbe 100644
--- a/plugins/OStatus/OStatusPlugin.php
+++ b/plugins/OStatus/OStatusPlugin.php
@@ -22,7 +22,9 @@
  * @maintainer Brion Vibber <brion@status.net>
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
+if (!defined('STATUSNET')) {
+    exit(1);
+}
 
 set_include_path(get_include_path() . PATH_SEPARATOR . dirname(__FILE__) . '/extlib/');
 
diff --git a/plugins/OStatus/actions/hostmeta.php b/plugins/OStatus/actions/hostmeta.php
index db4c913e16..14f69ac192 100644
--- a/plugins/OStatus/actions/hostmeta.php
+++ b/plugins/OStatus/actions/hostmeta.php
@@ -22,7 +22,9 @@
  * @maintainer James Walker <james@status.net>
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
+if (!defined('STATUSNET')) {
+    exit(1);
+}
 
 class HostMetaAction extends Action
 {
diff --git a/plugins/OStatus/actions/ostatusgroup.php b/plugins/OStatus/actions/ostatusgroup.php
index 7db00ffbef..24fbaac9ca 100644
--- a/plugins/OStatus/actions/ostatusgroup.php
+++ b/plugins/OStatus/actions/ostatusgroup.php
@@ -22,7 +22,9 @@
  * @maintainer Brion Vibber <brion@status.net>
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
+if (!defined('STATUSNET')) {
+    exit(1);
+}
 
 /**
  * Key UI methods:
diff --git a/plugins/OStatus/actions/ostatusinit.php b/plugins/OStatus/actions/ostatusinit.php
index f576823e31..91c36203c8 100644
--- a/plugins/OStatus/actions/ostatusinit.php
+++ b/plugins/OStatus/actions/ostatusinit.php
@@ -22,8 +22,9 @@
  * @maintainer James Walker <james@status.net>
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
-
+if (!defined('STATUSNET')) {
+    exit(1);
+}
 
 class OStatusInitAction extends Action
 {
diff --git a/plugins/OStatus/actions/ostatussub.php b/plugins/OStatus/actions/ostatussub.php
index 493b519657..a293fda5db 100644
--- a/plugins/OStatus/actions/ostatussub.php
+++ b/plugins/OStatus/actions/ostatussub.php
@@ -22,7 +22,9 @@
  * @maintainer Brion Vibber <brion@status.net>
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
+if (!defined('STATUSNET')) {
+    exit(1);
+}
 
 /**
  * Key UI methods:
diff --git a/plugins/OStatus/actions/ownerxrd.php b/plugins/OStatus/actions/ownerxrd.php
index 9e84f72ecb..3f99e1cbd0 100644
--- a/plugins/OStatus/actions/ownerxrd.php
+++ b/plugins/OStatus/actions/ownerxrd.php
@@ -22,7 +22,9 @@
  * @maintainer James Walker <james@status.net>
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
+if (!defined('STATUSNET')) {
+    exit(1);
+}
 
 class OwnerxrdAction extends XrdAction
 {
diff --git a/plugins/OStatus/actions/pushcallback.php b/plugins/OStatus/actions/pushcallback.php
index 6eec1ad16e..9b83d43c4d 100644
--- a/plugins/OStatus/actions/pushcallback.php
+++ b/plugins/OStatus/actions/pushcallback.php
@@ -22,7 +22,9 @@
  * @maintainer Brion Vibber <brion@status.net>
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
+if (!defined('STATUSNET')) {
+    exit(1);
+}
 
 class PushCallbackAction extends Action
 {
diff --git a/plugins/OStatus/actions/pushhub.php b/plugins/OStatus/actions/pushhub.php
index 68035ab5cc..bfd51ec02f 100644
--- a/plugins/OStatus/actions/pushhub.php
+++ b/plugins/OStatus/actions/pushhub.php
@@ -23,6 +23,10 @@
  * @maintainer Brion Vibber <brion@status.net>
  */
 
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
 /**
 
 
diff --git a/plugins/OStatus/actions/userxrd.php b/plugins/OStatus/actions/userxrd.php
index 8179505a55..c9b1d0a5be 100644
--- a/plugins/OStatus/actions/userxrd.php
+++ b/plugins/OStatus/actions/userxrd.php
@@ -17,7 +17,9 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-if (!defined('STATUSNET')) { exit(1); }
+if (!defined('STATUSNET')) {
+    exit(1);
+}
 
 /**
  * @package OStatusPlugin
diff --git a/plugins/OStatus/classes/FeedSub.php b/plugins/OStatus/classes/FeedSub.php
index 58beec6738..140f323846 100644
--- a/plugins/OStatus/classes/FeedSub.php
+++ b/plugins/OStatus/classes/FeedSub.php
@@ -17,6 +17,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
 /**
  * @package OStatusPlugin
  * @maintainer Brion Vibber <brion@status.net>
diff --git a/plugins/OStatus/classes/HubSub.php b/plugins/OStatus/classes/HubSub.php
index 825d36ebd6..e7ac23af58 100644
--- a/plugins/OStatus/classes/HubSub.php
+++ b/plugins/OStatus/classes/HubSub.php
@@ -17,6 +17,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
 /**
  * PuSH feed subscription record
  * @package Hub
diff --git a/plugins/OStatus/classes/Magicsig.php b/plugins/OStatus/classes/Magicsig.php
index 20025c37a6..e057deb144 100644
--- a/plugins/OStatus/classes/Magicsig.php
+++ b/plugins/OStatus/classes/Magicsig.php
@@ -27,6 +27,10 @@
  * @link      http://status.net/
  */
 
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
 require_once 'Crypt/RSA.php';
 
 class Magicsig extends Memcached_DataObject
diff --git a/plugins/OStatus/classes/Ostatus_profile.php b/plugins/OStatus/classes/Ostatus_profile.php
index 10cee917e1..47aee15f8a 100644
--- a/plugins/OStatus/classes/Ostatus_profile.php
+++ b/plugins/OStatus/classes/Ostatus_profile.php
@@ -17,6 +17,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
 /**
  * @package OStatusPlugin
  * @maintainer Brion Vibber <brion@status.net>
diff --git a/plugins/OStatus/classes/Ostatus_source.php b/plugins/OStatus/classes/Ostatus_source.php
index b76bbce56c..0fd74e48ba 100644
--- a/plugins/OStatus/classes/Ostatus_source.php
+++ b/plugins/OStatus/classes/Ostatus_source.php
@@ -17,6 +17,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
 /**
  * @package OStatusPlugin
  * @maintainer Brion Vibber <brion@status.net>
diff --git a/plugins/OStatus/lib/feeddiscovery.php b/plugins/OStatus/lib/feeddiscovery.php
index 8a166a0be5..d978cc6745 100644
--- a/plugins/OStatus/lib/feeddiscovery.php
+++ b/plugins/OStatus/lib/feeddiscovery.php
@@ -22,7 +22,9 @@
  * @maintainer Brion Vibber <brion@status.net>
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
+if (!defined('STATUSNET')) {
+    exit(1);
+}
 
 class FeedSubBadURLException extends FeedSubException
 {
diff --git a/plugins/OStatus/lib/hubconfqueuehandler.php b/plugins/OStatus/lib/hubconfqueuehandler.php
index 8219f8420e..d26c45be04 100644
--- a/plugins/OStatus/lib/hubconfqueuehandler.php
+++ b/plugins/OStatus/lib/hubconfqueuehandler.php
@@ -17,6 +17,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
 /**
  * Send a PuSH subscription verification from our internal hub.
  * @package Hub
diff --git a/plugins/OStatus/lib/huboutqueuehandler.php b/plugins/OStatus/lib/huboutqueuehandler.php
index 3ad94646e6..67a9d9e36b 100644
--- a/plugins/OStatus/lib/huboutqueuehandler.php
+++ b/plugins/OStatus/lib/huboutqueuehandler.php
@@ -17,6 +17,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
 /**
  * Send a raw PuSH atom update from our internal hub.
  * @package Hub
diff --git a/plugins/OStatus/lib/hubprepqueuehandler.php b/plugins/OStatus/lib/hubprepqueuehandler.php
index 0d585938f4..0ed6a3ec57 100644
--- a/plugins/OStatus/lib/hubprepqueuehandler.php
+++ b/plugins/OStatus/lib/hubprepqueuehandler.php
@@ -17,6 +17,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
 /**
  * When we have a large batch of PuSH consumers, we break the data set
  * into smaller chunks. Enqueue final destinations...
diff --git a/plugins/OStatus/lib/ostatusqueuehandler.php b/plugins/OStatus/lib/ostatusqueuehandler.php
index 5e0ab46a5b..d5ee0c5041 100644
--- a/plugins/OStatus/lib/ostatusqueuehandler.php
+++ b/plugins/OStatus/lib/ostatusqueuehandler.php
@@ -17,6 +17,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
 /**
  * Prepare PuSH and Salmon distributions for an outgoing message.
  *
diff --git a/plugins/OStatus/lib/pushinqueuehandler.php b/plugins/OStatus/lib/pushinqueuehandler.php
index 965d042668..ec1911653a 100644
--- a/plugins/OStatus/lib/pushinqueuehandler.php
+++ b/plugins/OStatus/lib/pushinqueuehandler.php
@@ -17,6 +17,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
 /**
  * Process a feed distribution POST from a PuSH hub.
  * @package FeedSub
diff --git a/plugins/OStatus/lib/salmonqueuehandler.php b/plugins/OStatus/lib/salmonqueuehandler.php
index 56d3c9eff2..e70d5ff521 100644
--- a/plugins/OStatus/lib/salmonqueuehandler.php
+++ b/plugins/OStatus/lib/salmonqueuehandler.php
@@ -17,6 +17,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+if (!defined('STATUSNET')) {
+    exit(1);
+}
+
 /**
  * Send a Salmon notification in the background.
  * @package OStatusPlugin
diff --git a/plugins/OStatus/lib/xrdaction.php b/plugins/OStatus/lib/xrdaction.php
index c8b5beff37..d1488dbdec 100644
--- a/plugins/OStatus/lib/xrdaction.php
+++ b/plugins/OStatus/lib/xrdaction.php
@@ -22,7 +22,9 @@
  * @maintainer James Walker <james@status.net>
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
+if (!defined('STATUSNET')) {
+    exit(1);
+}
 
 class XrdAction extends Action
 {
diff --git a/plugins/OpenID/User_openid.php b/plugins/OpenID/User_openid.php
index 1beff9ea30..e34cf21f2c 100644
--- a/plugins/OpenID/User_openid.php
+++ b/plugins/OpenID/User_openid.php
@@ -2,7 +2,10 @@
 /**
  * Table Definition for user_openid
  */
-require_once INSTALLDIR.'/classes/Memcached_DataObject.php';
+
+if (!defined('STATUSNET')) {
+    exit(1);
+}
 
 class User_openid extends Memcached_DataObject
 {
diff --git a/plugins/OpenID/User_openid_trustroot.php b/plugins/OpenID/User_openid_trustroot.php
index 17c03afb02..69e0a3f3e0 100644
--- a/plugins/OpenID/User_openid_trustroot.php
+++ b/plugins/OpenID/User_openid_trustroot.php
@@ -2,7 +2,10 @@
 /**
  * Table Definition for user_openid_trustroot
  */
-require_once INSTALLDIR.'/classes/Memcached_DataObject.php';
+
+if (!defined('STATUSNET')) {
+    exit(1);
+}
 
 class User_openid_trustroot extends Memcached_DataObject
 {
diff --git a/plugins/OpenID/finishaddopenid.php b/plugins/OpenID/finishaddopenid.php
index 47b3f7fb16..6eb2f2d206 100644
--- a/plugins/OpenID/finishaddopenid.php
+++ b/plugins/OpenID/finishaddopenid.php
@@ -27,7 +27,7 @@
  * @link      http://status.net/
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) {
+if (!defined('STATUSNET')) {
     exit(1);
 }
 
diff --git a/plugins/OpenID/finishopenidlogin.php b/plugins/OpenID/finishopenidlogin.php
index 0c03b5c4db..01dd61edb1 100644
--- a/plugins/OpenID/finishopenidlogin.php
+++ b/plugins/OpenID/finishopenidlogin.php
@@ -17,7 +17,9 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
+if (!defined('STATUSNET')) {
+    exit(1);
+}
 
 require_once INSTALLDIR.'/plugins/OpenID/openid.php';
 
diff --git a/plugins/OpenID/openid.php b/plugins/OpenID/openid.php
index 1b93163e5f..ad251aa2cd 100644
--- a/plugins/OpenID/openid.php
+++ b/plugins/OpenID/openid.php
@@ -17,9 +17,9 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
-
-require_once(INSTALLDIR.'/plugins/OpenID/User_openid.php');
+if (!defined('STATUSNET')) {
+    exit(1);
+}
 
 require_once('Auth/OpenID.php');
 require_once('Auth/OpenID/Consumer.php');
diff --git a/plugins/OpenID/openidlogin.php b/plugins/OpenID/openidlogin.php
index 20d6e070cd..4046068cfa 100644
--- a/plugins/OpenID/openidlogin.php
+++ b/plugins/OpenID/openidlogin.php
@@ -17,7 +17,9 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
+if (!defined('STATUSNET')) {
+    exit(1);
+}
 
 require_once INSTALLDIR.'/plugins/OpenID/openid.php';
 
diff --git a/plugins/OpenID/openidserver.php b/plugins/OpenID/openidserver.php
index b2cf1f8ac3..ed9db4fd28 100644
--- a/plugins/OpenID/openidserver.php
+++ b/plugins/OpenID/openidserver.php
@@ -28,13 +28,11 @@
  * @link      http://status.net/
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) {
+if (!defined('STATUSNET')) {
     exit(1);
 }
 
-require_once INSTALLDIR.'/lib/action.php';
 require_once INSTALLDIR.'/plugins/OpenID/openid.php';
-require_once(INSTALLDIR.'/plugins/OpenID/User_openid_trustroot.php');
 
 /**
  * Settings for OpenID
diff --git a/plugins/OpenID/openidsettings.php b/plugins/OpenID/openidsettings.php
index 505e7d0ee3..b7d5bd084d 100644
--- a/plugins/OpenID/openidsettings.php
+++ b/plugins/OpenID/openidsettings.php
@@ -27,11 +27,10 @@
  * @link      http://status.net/
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) {
+if (!defined('STATUSNET')) {
     exit(1);
 }
 
-require_once INSTALLDIR.'/lib/accountsettingsaction.php';
 require_once INSTALLDIR.'/plugins/OpenID/openid.php';
 
 /**
diff --git a/plugins/OpenID/openidtrust.php b/plugins/OpenID/openidtrust.php
index ed6ca73a47..89f3150f63 100644
--- a/plugins/OpenID/openidtrust.php
+++ b/plugins/OpenID/openidtrust.php
@@ -17,10 +17,11 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
+if (!defined('STATUSNET')) {
+    exit(1);
+}
 
 require_once INSTALLDIR.'/plugins/OpenID/openid.php';
-require_once(INSTALLDIR.'/plugins/OpenID/User_openid_trustroot.php');
 
 class OpenidtrustAction extends Action
 {
diff --git a/plugins/TwitterBridge/twittersettings.php b/plugins/TwitterBridge/twittersettings.php
index dab8ab34fe..33c5eb65bb 100644
--- a/plugins/TwitterBridge/twittersettings.php
+++ b/plugins/TwitterBridge/twittersettings.php
@@ -247,6 +247,11 @@ class TwittersettingsAction extends ConnectSettingsAction
         $user = common_current_user();
         $flink = Foreign_link::getByUserID($user->id, TWITTER_SERVICE);
 
+        if (empty($flink)) {
+            $this->clientError(_m('No Twitter connection to remove.'));
+            return;
+        }
+
         $result = $flink->safeDelete();
 
         if (empty($result)) {