title: Can I know from the callback function, if user shared the link with "Friends" or "Only me"?
body: <p>I'm making a mobile game in which the player can Share his score. 
  I want to know whether he shared with "Only me" or with all his friends.</p>
  
  <p>Can this information be retrieved from the callback function?</p>
  
  <p>The Facebook documentation says the Response Data is "post_id", but I'm not sure I searched the right docs. </p>