title: graph.facebook.com/username does not work
body: <p>I tried to get user detail using <a href="https://graph.facebook.com/username">https://graph.facebook.com/username</a> . But it throws an error </p>
  
  <pre><code>    "error": {
        "message": "(#803) Cannot query users by their username (ramesh.randika.56)",
        "type": "OAuthException",
        "code": 803
     }
  </code></pre>
  
  <p>does anybody have  a solution for this problem.</p>