Many people who are new to Facebook can’t find use of Poke because they don’t know what it means. It’s a way to say hello to anyone. We can poke our friends or we can poke people who are in shared network and friend of a friend.
If you poke someone then they can see your profile and add you if they know you or they are interested in you. If they poke you back then you can view their profile to know more about them. Profile viewing is only valid for 3 day.
Poke is used at at Facebook only and it is mostly used to get attention from friends. If we can’t send hi to all friends then we can simply poke them. Poke meaning also referred to I am missing you, How are you, miss you etc depends or your relationship with the friend.