title: Force user to enter login credentials on facebook for auth login even if he has facebook session on browser
body: <p>I am implementing a functionality to login facebook user via auth. For this I am redirecting the user to facebook using following url</p>
  
  <p><a href="https://www.facebook.com/dialog/oauth?display=popup&amp;client_id=xxxxxxxxx&amp;redirect_uri=xxxxxxxxx&amp;scope=user_about_me,friends_about_mefriends_website,offline_access,email&amp;state=facebookgraph" rel="nofollow">https://www.facebook.com/dialog/oauth?display=popup&amp;client_id=xxxxxxxxx&amp;redirect_uri=xxxxxxxxx&amp;scope=user_about_me,friends_about_mefriends_website,offline_access,email&amp;state=facebookgraph</a></p>
  
  <p>now if I do not have logged in to facebook in same browser then it works fine. But if I already have session then redirects me back to my site with the code from the same session. I saw some sites that always ask for login credentials (no matter if I have fb session or not). </p>
  
  <p>I found some settings in "Advanced" tab of my fb application saying "Forces use of login secret for auth.login" and I enabled it but still no success. Is there any option to do so?</p>
  
  <p>Thanks</p>