title: Extract current facebook username using iOS SDK 4
body: <p>I am using Graph API to get facebook user information as follows:</p>
  
  <pre><code>[facebook requestWithGraphPath:@"me" andDelegate:self];
  </code></pre>
  
  <p>How can I do this? I know that server response is in the form of JSON object but don't know how to parse it. </p>