Facebook just launched another new feature. You can now log in to your account using either your Facebook username or your email address. If you haven’t set-up a username (a.k.a. vanity URL) for your personal profile, go to http://www.facebook.com/username/ to create yours.
From the Facebook website:
Usernames can only contain alphanumeric characters (A-Z, 0-9) or a period [...]
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