Both sides are being investigated.
You have the zombie sheep's post above for confirmation they are working on the Mac side and for the PC side :
Please everyone. Keep calm as this will be investigated and solved.
Share the two above links (and zombie sheep's one for Macs if anyone asks) as far and as wide as you can.
You can also look here to see why everything is probably still down....
Im guessing they are trying to figure out how to patch this...
I am sure they will let everyone know when the problem is fixed. They should be giving an update soon.
For everyone Else:
After all it is a Sunday, I am sure that most of the developers are not working today and are being pulled from home to help with the problem. And the fact that the problem might just be a typo in the coding. Couple these two together and you get a problem that might take a few hours or more to solve. Patience. Go outside and do something for a while and come back and check. Get caught up on laundry or chores or work and check later. It will be solved and the problem will be over in a few hours. Patience. Patience. Patience.
Anyone here NOT have an authenticator? I'd take mine off temporarily to log in if needed.
Has nothing to do with authenticators believe me.
You're only decreasing your account security that way.
I understand the login server's randomly letting people in now but there's indications it may go down again.