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A Facebook nob is someone who adds you back just to show off, even though they can't remember your face and you're still mad about that time they called you 'fanny' in 2012.
'Hey, I accepted your friend request! I'm so popular!' (They still think you're a kid.)
They sent you a message that was just a picture of a monkey throwing a banana at a butt.
Their status is 'I'm sad because the sky is blue and my ex is with my best friend.'