title: Facebook OAuth shows "you must log in first"
body: <p>I want to make MyApp name show on the upper space as Facebook Samples shown.
  But even the source code is the same with the sample's, the raw/layout data are the same, too. I don't know why MyApp shows only "You must log in first".</p>
  
  <p>Is anything I missed?</p>
  
  <p><img src="https://i.stack.imgur.com/jNi2H.png" alt="Different from MyApp with FacebookDemo"></p>
  
  <p>Now I put my whole source code up to the share space: <a href="http://qfs.mobi/f689673" rel="nofollow noreferrer">http://qfs.mobi/f689673</a><br>
  And I found it seems not login successful if I input the right information.</p>