Poke...

A stranger from Toronto just "poked" me on Facebook and I don't know what to do. First of all, I am not sure what a "poke" on Facebook means and secondly I am unsure whether or not I should be returning "pokes" to strange Canadians on Facebook. I became a member of the Facebook nation because a friend I trusted asked me too. Now I am wrestling with the Facebook jargon and contact with strangers.