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k it's in. It's set as purely optional, so no mandatory putting in info you don't want...(you can always put in the right month/day and lie about the year

On your birthday you will get a popup with naked menz or womenz which will be singing something overly loud and obnoxious and will make your CD tray eject, and email your boss in your name saying you quit and hope he gets a nasty infection in a very embaressing place. (not really, it just says happy birthday from us so you know we love you, or something)
And uh...that's about it - to set your birthday, go to your profile and about halfway down pop it in.