Am I a total moron, or is the signup site broken? I've tried my facebook email address, the email address I used to sign up for an invite, my facebook username

Am I a total moron, or is the signup site broken? I've tried my facebook email address, the email address I used to sign up for an invite, my facebook username, and a username of my own choosing, and in all cases, it tells me "Connecting with Facebook is required."