 <p>Facebook will do a POST to the URL you specific in the form (http://apps.facebook.com/gcmobtest/). The POST will have a field called "ids" that will contain the user IDs that were selected. <a href="http://developers.facebook.com/docs/reference/fbml/multi-friend-input/" rel="nofollow">http://developers.facebook.com/docs/reference/fbml/multi-friend-input/</a></p> <p>Facebook has released a non-FBML version (javascript) of the the friend request that returns the IDs directly, if any were selected. <a href="http://developers.facebook.com/docs/reference/dialogs/requests/" rel="nofollow">http://developers.facebook.com/docs/reference/dialogs/requests/</a></p> <p>In typical Facebook fashion, they released v1.0 on Jan 26 (http://developers.facebook.com/blog/post/453) and released 2.0 on Feb 16 (http://developers.facebook.com/blog/post/464).</p>