[albedoa]

Yes. It is the most prominent method of joining that they display on the landing page. This is real.

Edit: Granted, they relaunched it as a social gaming site, so that signup method makes a bit more sense.

[guillermovs]

They probably get paid to implement Facebook connect on their million+ userbases though. So it may make more sense that way. Although to be fair allowing access to 750m (fb) users is a sensible enough argument.