title: Freebase Twitter Extension
body: <p>I have tried the Freebase MQL twitter search extension shown here:</p>
  
  <p><a href="http://www.freebase.com/docs/mql_extensions/.base.topics.news.twitter_mentions" rel="nofollow">http://www.freebase.com/docs/mql_extensions/.base.topics.news.twitter_mentions</a></p>
  
  <p>and there appears to be an error. There is no documentation for this extension (at least I didn't find it). Could anyone tell me if there is?</p>
  
  <p>Does anyone know if any of these extensions are being supported at all? </p>