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2.
The term used for the collection of people, on your Facebook friends list, that you don’t actually talk to or know in real life. Related to popular tv program and game pokeamon, where the aim is to collect as many diffrent Pocket Monsters as possible.
Dave - "Hey, my friends collection is getting up to two hundred"

Steve - "How many do you really know? go admit it, most of them are Facebookemon"

John - "Gotta catch em all, gotta catch em all"
by Tommy L March 12, 2009
 
1.
Someone you don't really know , but would like people to think you do.
"Look, Man, I will not be your 'Facebookemon'". (In reply to an unwanted friend request.)
by Beatrice Kiddo March 23, 2009