Check out PC World's Facebook Etiquette tips, ah
if only everyone would pay attention. What's the purpose of "poking" anyway? I never really understood that one 
"What's okay on Facebook? On sites like MySpace, anything goes (or seems to), but the rules of etiquette on Facebook seem to be a little more refined--not a lot, mind you, but a little. Keep these tips in mind, whether you're making your first friend or your 1000th."
Check them out here

OUCH! i felt that poke 
Karma, it works every time!

Wellington Florida
Married
Most to these ppl should already know but I will be sure to point this out to a cousin of mine who felt the need to tell us all that he "Just laid a log in the bathroom and is now feeling thinner" To which I commented Dude seriously your a adult didn't the fun of poop chat end like 15 years ago? Thanks for the update though
I then pointed him to the Dropping A Deuce thread.
Ok I really don't get the poking either but after reading it some how I felt the need to poke you on facebook