Squashed commit of the following:

commit 7ef19ab918cc9805abb8d01e8220ae4ed63155d7
Author: Evan Prodromou <evan@status.net>
Date:   Mon Jul 9 12:53:29 2012 -0400

    Show link to facebook account on profile block

    If you've logged in with Facebook, show a link to that account on the profile block.

commit b56967479c009d702150791944dbd80746ee3ba1
Author: Evan Prodromou <evan@status.net>
Date:   Mon Jul 9 12:28:34 2012 -0400

    Add profile link from profile block to Twitter account

    Add a profile link to Twitter for accounts that are linked via Twitter login.

commit 181e441fd03c6034e737f6a3dae115557aa3e1aa
Author: Evan Prodromou <evan@status.net>
Date:   Mon Jul 9 11:57:56 2012 -0400

    OpenID shows other account links

commit ef7357883dad9e34af2746e1c6a41ea826d7c992
Author: Evan Prodromou <evan@status.net>
Date:   Mon Jul 9 11:53:12 2012 -0400

    Add a profile link for OpenIDs

    OpenID plugin now adds a profile link for each OpenID on the account.

commit 093d26b95bc453686d24c42f5a8f4739cb338fd2
Author: Evan Prodromou <evan@status.net>
Date:   Mon Jul 9 11:15:18 2012 -0400

    Better array access

commit 49d47257efdcae2101b589a1f825872bdd70667c
Author: Evan Prodromou <evan@status.net>
Date:   Mon Jul 9 10:57:16 2012 -0400

    Show list of other accounts in profile block

    We add a group of "rel-me" links to other user accounts on the Web.

    This is mostly useful for when you've used OpenID, Twitter, or
    Facebook login to associate a remote account.

    There's an extension to the profileblock recipe to show the links as
    little icons; there's a new hook in accountprofileblock to get such
    links from plugins.

    There's a modification to the base theme to show the icons correctly
    (I think).

plugins/FacebookBridge/FacebookBridgePlugin.php

@@ -559,6 +559,69 @@ ENDOFSCRIPT;
         return true;
     }
 
+    /**
+     * Add links in the user's profile block to their Facebook profile URL.
+     *
+     * @param Profile $profile The profile being shown
+     * @param Array   &$links  Writeable array of arrays (href, text, image).
+     *
+     * @return boolean hook value (true)
+     */
+
+    function onOtherAccountProfiles($profile, &$links)
+    {
+        $fuser = null;
+
+        $flink = Foreign_link::getByUserID($profile->id, FACEBOOK_SERVICE);
+
+        if (!empty($flink)) {
+
+            $fuser = $this->getFacebookUser($flink->foreign_id);
+
+            if (!empty($fuser)) {
+                $links[] = array("href" => $fuser->link,
+                                 "text" => sprintf(_("@%s on Facebook"), $fuser->name),
+                                 "image" => $this->path("images/f_logo.png"));
+            }
+        }
+
+        return true;
+    }
+
+    function getFacebookUser($id) {
+
+        $key = Cache::key(sprintf("FacebookBridgePlugin:userdata:%d", $id));
+
+        $c = Cache::instance();
+
+        if ($c) {
+            $obj = $c->get($key);
+            if ($obj) {
+                return $obj;
+            }
+        }
+
+        $url = sprintf("https://graph.facebook.com/%s", $id);
+        $client = new HTTP_Client();
+        $resp = $client->get($url);
+
+        if (!$resp->isOK()) {
+            return null;
+        }
+
+        $user = json_decode($resp->getBody());
+
+        if ($user->error) {
+            return null;
+        }
+
+        if ($c) {
+            $c->set($key, $user);
+        }
+
+        return $user;
+    }
+
     /*
      * Add version info for this plugin
      *

plugins/OpenID/OpenIDPlugin.php

@@ -814,4 +814,30 @@ class OpenIDPlugin extends Plugin
 
         return true;
     }
+
+    /**
+     * Add links in the user's profile block to their OpenID URLs.
+     *
+     * @param Profile $profile The profile being shown
+     * @param Array   &$links  Writeable array of arrays (href, text, image).
+     *
+     * @return boolean hook value (true)
+     */
+    
+    function onOtherAccountProfiles($profile, &$links)
+    {
+        $oid = new User_openid();
+
+        $oid->user_id = $profile->id;
+
+        if ($oid->find()) {
+            while ($oid->fetch()) {
+                $links[] = array('href' => $oid->display,
+                                 'text' => _('OpenID'),
+                                 'image' => $this->path("icons/openid-16x16.gif"));
+            }
+        }
+
+        return true;
+    }
 }

plugins/TwitterBridge/TwitterBridgePlugin.php

@@ -557,4 +557,32 @@ class TwitterBridgePlugin extends Plugin
         }
         return true;
     }
+
+    /**
+     * Add links in the user's profile block to their Twitter profile URL.
+     *
+     * @param Profile $profile The profile being shown
+     * @param Array   &$links  Writeable array of arrays (href, text, image).
+     *
+     * @return boolean hook value (true)
+     */
+
+    function onOtherAccountProfiles($profile, &$links)
+    {
+        $fuser = null;
+
+        $flink = Foreign_link::getByUserID($profile->id, TWITTER_SERVICE);
+
+        if (!empty($flink)) {
+            $fuser = $flink->getForeignUser();
+
+            if (!empty($fuser)) {
+                $links[] = array("href" => $fuser->uri,
+                                 "text" => sprintf(_("@%s on Twitter"), $fuser->nickname),
+                                 "image" => $this->path("icons/twitter-bird-white-on-blue.png"));
+            }
+        }
+
+        return true;
+    }
 }