title: fql query of group feed returns "attachment unavailable" in posts of specific users
body: <p>I am using the graph api explorer to get the feed of a group that I am member of. I do this:</p>
  
  <p><a href="https://developers.facebook.com/tools/explorer/?method=GET&amp;path=336919223017003%2Ffeed%3Flimit%3D25" rel="nofollow">https://developers.facebook.com/tools/explorer/?method=GET&amp;path=336919223017003%2Ffeed%3Flimit%3D25</a></p>
  
  <p>The posts in this group contain YouTube videos, and they have a "type: video", and also a link,source,name properties of the videos. most of the posts are OK.
  But there are some posts that don't contain the video's properties. instead , "caption" value holds this error message:</p>
  
  <p>"Attachment UnavailableThis attachment may have been removed or the person who shared it may not have permission to share it with you."</p>
  
  <p>These posts are from specific users. I mean, posts of these users consistently contain this error message above. (which makes sense because the error suggests that I don't have permissions for these user's posts)</p>
  
  <p>So How do I solve this: would it help if I was admin of this group? Do I need to ask people of the group to change some permissions in their accounts and what exactly?</p>