One who is signed up to Facebook but only uses it to comment on others pictures, and upload their own; a dedicated camwhore who loves critiscizing the way you look in passive aggressive way. Easily identifiable, as they'll usually upload a hundred or so photos a day and have the insatiable habit of rating all of your photos out of 10.
Isaac: "Oh yeah, did you hear? Jenny finally signed up for Facebook."
Josh: "Yeah, I know."
Isaac: "She's fit, you should add her."
Josh: "No thanks - it's been 3 days and she's already got 2,000 photos uploaded. The last thing I need is a Facebook fabulist on my profile."