title: Facebook sending authorized signed_request after removing app
body: <p>I'm developing a facebook canvas app and for testing purposes, sometimes I go to my account settings and delete the app (to force re-authorizing the app).</p>
  
  <p>The problem I'm facing is that even after I do this, when I access the app, facebook still sends me a signed_request with user_id and a valid oauth_token, as I had authorized the app.</p>
  
  <p>Is there any cache or delay for facebook to take my removal into account?</p>
  
  <p>What could have been happening?</p>