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Why do I have to still log-in to Facebook? Why can't I run Windows games on my iPad? Why can't I just talk to my computer like Star Trek?

Programmers know why, but users don't. Same goes for icons: designers know what they're doing & why...

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

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.

You can log in with your URL.

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