title: How to get user is fan in Facebook pagetab app mobile version?
body: <p>I create a pagetab application.
  I set the mobile site url to be usable with mobile.</p>
  
  <p>In the application I check the signed request to see the user is fan:</p>
  
  <pre><code>        if($signed_request['page']['id'] == $myPageId) {
              $is_fan = $signed_request['page']['liked'] ? true : false;
          }
  </code></pre>
  
  <p>But in the mobile version Facebook doesn't post signed request, even then the user is logged in (give permission).</p>
  
  <p>I can ask user_likes permission, so I can check liked pages, but I don't want to use extra permissions..</p>
  
  <p>It is possible to solve this without user_likes perm?</p>
  
  <p>Regards,
  F </p>