title: Detecting if a Facebook post has been deleted or has high privacy settings
body: <p>I want to know with the opengraph FB API if a post is deleted or has high privacy settings. 
  If I do a request to a specific post_id that is under one of the two previous parameters the response is ever something like "unsupported get request".</p>
  
  <p>My question: is there a method that can I differentiate if the post exists (and then is under privacy settings) or if the post not exists anymore (deleted)?</p>