title: facebook check ask for additional permissions after user is logged in
body: <p>Let's say I have an facebook application running using the JS SDK.</p>
  
  <p>First user clicks on LINK A, and I do a call to FB.login() asking for the "email" permission.</p>
  
  <pre><code>&lt;a href="#" onclick="doLogin();&gt;LINK A&lt;/a&gt;
  &lt;script&gt;
  function doLogin() {
  FB.login(function (res) {
  //res contains authResponse, i.e. the user is logged in.
  }, { scope : 'email'} });
  }
  &lt;/script&gt;
  </code></pre>
  
  <p>Then I will do a check on authResponse to check if user logged in or not.</p>
  
  <pre><code>if(res.authResponse) {
  //User logged in
  } else {
  //User NOT logged in
  }
  </code></pre>
  
  <p>NOW let's say that on LINK B, I want to ask for the "user_birthday" permission:</p>
  
  <pre><code>FB.login(function (res) {
  //Now res.authResponse is set even if user did NOT grant access to the "user_birthday" permission
  }, { scope : 'user_birthday'} });
  </code></pre>
  
  <p>However when the request for "user_birthday" is made the user is already logged in to the application - and therefore authResponse will be set regardless if user granted access to the additional permission, or clicked cancel.</p>
  
  <p><em>Is there a way to check if user gave the additional permission?</em></p>
  
  <p>I know I can do a lookup on the api on /me/permissions - but I wonder if there's a way to do it in the FB.login() callback?</p>