Just found out that on Facebook the username is optional
Everyone is known by their real first and last name. So Facebook API in most cases does not return value for username because it's optional and most people never set it up.
I just find this unusual but at the same time they may be on to something.
This makes it so much easier to integrate the Facebook Connect into your existing login system - because there could not be any name collisions with existing users in your database
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