title: Facebook login in mobile browser via Facebook app
body: <p>I have a Node.js web app with Facebook login (using PassportJS, OAuth 2.0). The login works in the browser (Chrome 50) on desktop.</p>
  
  <p>In the browser on mobile (Android, iOS), the login also works but it asks the user to login to Facebook in their browser, even if they are already logged into their Facebook App.</p>
  
  <p>For the browser on mobile case, is it possible to somehow authenticate the user via the Facebook App (if installed) rather than Facebook in the browser?</p>