It seems you can not log into battle.net using facebook because it says “ App not active: This app is not accessible right now and the app developer is aware of the issue. You will be able to log in when the app is reactivated.” I believe the devs need to go to the “Facebook developer” portal, and fill out the weird “data usage checkup” form. This has been going on for a week now. Please fix asap and thank you.
Sama here. Please fix this asap.