title: Are tfbnw.net email addresses suspicious for facebook login
body: <p>I have a mobile app that allows logging in with facebook, when a user logs in I pull their email from the graph api but I just got a couple of logins with email addresses with @tfbnw.net domains which I guess is for test users while developing on facebook.  I didnt generate these so is this someone doing something shady to login to my app or just expected behavior for some users given their settings?</p>
  
  <p>Mobile app coded in react-native, using expo</p>