Use Your Gamer Launch Account
Your account from any Gamer Launch site is valid here.
If you already have a Gamer Launch account connect your Facebook account on your user profile first before using Facebook connect to login. Otherwise you may end up with a new account.
Ahh the good old days... Just when you are in the middle of a raid, Blizzard kicks the power out. Reroll on the one server that still IS online and "Dont have a Cow".