title: FB API GRAPH: why I can't catch the user email?
body: <p>I'm trying to retreive the email of a user logging into my web app; here's my code:</p>
  
  <pre><code>  FB.api('/me', function(response) {
      console.log(response.name + ', ' + response.email);
    });
  </code></pre>
  
  <p>the user name is correct, but email results as </p>
  
  <blockquote>
    <p>undefined</p>
  </blockquote>
  
  <p>Where am I going wrong?</p>