Skip enqueueing to outgoing bridges on incoming remote messages. Twitter, Facebook, RSSCloud, and OStatus checks were enqueued on these when they'd never do anything but churn the queue servers.

Notice::isLocal() can replace a number of manual checks for $notice->is_local being LOCAL_PUBLIC or LOCAL_NONPUBLIC.

plugins/Facebook/FacebookPlugin.php

@@ -585,7 +585,7 @@ class FacebookPlugin extends Plugin
 
     function onStartEnqueueNotice($notice, &$transports)
     {
-        if (self::hasKeys()) {
+        if (self::hasKeys() && $notice->isLocal()) {
             array_push($transports, 'facebook');
         }
         return true;