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Someone who's always on Facebook. A Facebook addict.
Jody is finishing dinner and logging to play WoW. Laters, facers!

Hey, just because I leave FB open on my BB all the time doesn't mean I'm a Facer!
by Russell Clark February 22, 2009
Usually some annoying girl that goes out of her way to bother the hell out of you.
Man, Phuong is such a facer!
by awedkjdf August 24, 2006