title: "unsupported get request" for a post that exists and is publicly visible
body: <p>The following public post which is visible on the page it was posted (it is not "hidden") is a mystery to me: <a href="https://www.facebook.com/Orange.France/posts/833781953305851" rel="nofollow">https://www.facebook.com/Orange.France/posts/833781953305851</a></p>
  
  <p>i.e., it is not available in the page's /feed edge, and the graph API can't retrieve it either. The following command returns an "unsupported get request":</p>
  
  <pre><code>curl https://graph.facebook.com/170852259598827_833781953305851?access_token=XXX
  </code></pre>
  
  <p>I tried also the following without much success: </p>
  
  <pre><code>curl https://graph.facebook.com/833781953305851?access_token=XXX 
  </code></pre>
  
  <p>In both cases, I tried the access_token of the page as well a random access_token generated from the graph explorer.</p>
  
  <p>So, the question is: how can I retrieve this post through the FB API ?</p>