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1.
A group of people who are not blood relations listed on facebook profile as a member of your immediate family (e.g. mother (facemum), father (facedad), brother (facebro) or sister (facesis).)
Charlie: You're pretty close with Fin, aren't you?
Adam: Yeah, he's one of my best friends and a facebro.

Dan: I didn't know you had a brother, dude.
Josh: Oh, lol, I don't really. That guy's just part of my facefamily. None of my real family actually has facebook!
by A J Dinny November 22, 2010