1 definition by PoisonPen
a Facebook user who logs on and lies in wait for someone else to log on, so that they can immediately trap them in a conversation.
Hm, I think I'll log into Facebook.
2 seconds later:
new message from Jason: HEY!!!!!
Damn, what a Facebook Shark.
2 seconds later:
new message from Jason: HEY!!!!!
Damn, what a Facebook Shark.
by PoisonPen May 24, 2009