after logging in with facebook, there is a in-game sign-in if you don't want to use the facebook login. Due to ALTs we can't really allow non-fb signups.
What is an ALT?
Asinine License Terms?
It means Alternate account. players are pretty bitter about the use of ALTs because they're used to join opponent alliances and then spy on them. hence, most alliances now have a pretty rigorous "getting to know you period"