title: getting facebook post impression that was sent via website app
body: <p>is there a way to retrieve impressions of a post that was made via my app? I've fetched the insights for my app, but don't know how to get the post id, and retrieve "insights" for that post-id (like: impressions, activity on this post, etc).</p>
  
  <p>Is there a way to achieve this throught graph api?</p>
  
  <p>Thanks,
  Ramo</p>