title: Facebook callback when user likes a post
body: <p>I have an iOS app that posts to the users Facebook timeline. Is there a way to get notified whenever  this post is being liked?</p>
  
  <p>I.e. User X clicks on Like, Facebook calls something like <a href="http://example.com/liked?post=1234&amp;by=5678" rel="nofollow">http://example.com/liked?post=1234&amp;by=5678</a></p>
  
  <p>If not, does the Graph API offer some way to monitor the users graph?</p>