title: Get permalink to a post published on user's wall
body: <p>Using Facebook dialogs, app users can share stories. I wish to be able to construct a permalink to the published story and offer as link to view the post. What we receive in response is the post_id, which alone doesn't look sufficient.</p>
  
  <p>Would it possible to construct a permalink based alone on the post_id, if not, what other approach are possible?</p>
  
  <p>Thanks a ton for your time.</p>