title: facebook sdk in android app, only able to login, but not able to logout?
body: <p><strong>in facebook sdk 3.0 logout not working</strong> </p>
  
  <p>I have already tried </p>
  
  <p><strong>1.</strong></p>
  
  <pre><code>Facebook mFb=new Facebook("xxxxxxxx");
  mFb.logout(this);
  </code></pre>
  
  <p><strong>2.</strong></p>
  
  <pre><code>if (Session.getActiveSession() != null) 
   {
    Session.getActiveSession().closeAndClearTokenInformation();
   }
  Session.setActiveSession(null);
  </code></pre>