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Facebook Phantoms are sneaky buggers who watch your Facebook like it's a soap opera. They don't comment or like anything, but they know every detail of your life and will drop it on you when you least expect it. They can be anyone, your best friend, your boss, or that guy who once spilled coffee on your shoes.
Your mom comments on your ex's photo and tags you.
Your coworker knows you got a promotion before your boss did.
That guy who sits next to you on the bus just posted a status about your weird hat.