title: FirebaseAuth android get Facebook friends list
body: <p>I use facebook login in my app. Once the users are logged-in I can get their basic facebook info such as display name, email, and phot url.
  I'd like to get their facebook friends list. I think I can get it "directly" with firebase but I don't remember how and I cannot find any info about it. I think I first have to tell Firebase to get friends list when people login with facebook, then I sould be able to get it with a method such as firebaseAuth.getCurrentUser().getFriendList().</p>
  
  <p>Do you know how to get facebook friends list with firebaseAuth ?</p>
  
  <p>Thank you,</p>
  
  <p>Alex</p>