Somebody who pokes people on facebook and then holds on to their reply poke without poking back. They will often try to hold pokes from as many people as they can manage, possibly as a 'challenge' to themselves.
I tried to poke xxxx yesterday but facebook says she hasn't 'received' my last one - that girl is a poke whore!
A facebook user who poke's lots of people of the opposite sex.
girl : you know eric has been poking me like everyday.
Friend : Omg he pokes me too. He is such a poke whore !