title: Facebook Android SDK, prompt user authentication to switch sessions
body: <p>This is kinda hard to explain. I'm building an application on android which is supposed to be used in a meeting in like a "stand" so people would submit some feedback after the meeting. Please notice there's a bunch of people who is going to use this application on the same device.</p>
  
  <p>The application is gonna be used from different users on the same device and all of them are supposed to login with their Facebook account before continuing. For security reasons, I would love to have a way to distroy a Facebook session after a poll is submitted or simply, every time a new poll is issued, when the user is requiered to login on Facebook, I would like to force Facebook to prompt an authentication dialog (username and password again) even though there's an active session.</p>
  
  <p>I've looked everywhere and I have found nothing. I know there's a way to request on Facebook a extensed permission to logout, but please notice this permission needs to be approved after logging in, so if a user, after logging in, just decide not to approve this permission, this session is going to be there until a browser is opened and a logout is performed from the Facebook site.</p>
  
  <p>I've also thought on destroying a browser cookies but I don't know if is there such a permission on the android SDK to perform this.</p>
  
  <p>Please, if any body has any idea on to get rid of this issue, I would really appreciate any suggestion or work around.</p>