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The question is why Facebook forces you to use an E-mail address as a user ID. Now THAT's amateur hour.

You can log in with your URL.

Assuming you've defined one, and a URL is not an appropriate user ID either.

They don't.

Hm, yeah, check their page:

Munch munch! It's fun to play stupid, right?

You can use your vanity username that appears in the url of your profile page. You can also use your phone number.