Bingo Pop's friends list is supported with Facebook. If your Facebook friends are no longer appearing in the game, you will need to refresh the access "token".

Facebook requires that users sign into their accounts every 90 days, otherwise the account access token expires in games - this results in your Facebook-connected account appearing as a guest and may cause issues with your friends list.

Try the following steps to refresh your access token:
  1. Uninstall the Bingo Pop app.
  2. Sign out of then back into the Facebook App on your device (If you do not have the Facebook app installed, please sign into your Facebook account through your mobile browser).
  3. Reinstall Bingo Pop.
  4. Launch the Bingo Pop app, then connect via Facebook to retrieve your progress.