title: facebook page_fan check query incomplete result
body: <p>I made a FB app for page.</p>
  
  <p>and check the user likes the page by the app.</p>
  
  <p>I use two kinds of API. and they work well.</p>
  
  <ol>
  <li><p>FB.Data.query('SELECT uid FROM page_fan WHERE page_id=$pageid and uid=$userid')
  and check number of rows.</p></li>
  <li><p>FB.api({ method: 'pages.isFan', page_id: '$pageid',uid:'$userid' })
  and check it returns 'true'.</p></li>
  </ol>
  
  <p>but some users appeal to our page. (</p>
  
  <p>They already like our page. but they still handled as not a fan.</p>
  
  <p>Actually API returns false.</p>