QUOTE(rehal123 @ Aug 15 2013, 07:40 AM)
The poke is a feature of Facebook whose sole purpose is to attract the attention of another user. The only thing that happens when you poke someone is that this person receives a poke alert on his or her home page.
As pokes attract the attention of a user, they can be used for various different things and thus have different meanings. You can, for instance, poke a friend just as a way of saying “Hello.”
I didn't know is such thing on facebook