title: Using graph-api/fql, How do I get the post/comment that caused a notification?
body: <p>I can traverse the list of notifications by using FQL. Great. Now, how do I figure out how to get the post/comment to which the notification applies?</p>
  
  <p>Example:
  The notification is: "UserX commented on your post!"</p>
  
  <p>From the fql table returned, how do I find the post_id or the xid for said comment so that I can find the post and the list of comments?</p>