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1.
A guy who thinks he's so popular just because he has +600 friends on Facebook, messed up statuses (example: '2m' for tomorrow. Or doubling the last letter, example: 'outt' instead of 'out'), writes poems/ surveys/ anything in their notes section and tags people they don't even know to make themselves look popular, has a profile picture of them taking a picture of themselves in the mirror flashing the peace sign and looking away from the camera, and someone who is a major conformist. Facebook Man-Whores are ALWAYS very shallow, superficial, and cocky.
Shannon: I hate Alex, he's such a Facebook Man-Whore.
John: I know, no one even likes him. When is he gonna learn that he's conceited?
by Plumeburst April 18, 2009
 
2.
A guy on facebook who comments on any girl's photo and claims to be a flirt but in real life has few to no friends and get any ass.
Facebook Manwhore, manwhore
by TheMexicanBrat November 16, 2011