I’ve been playing the numbers game on Facebook for hours. The game is simple: just announce on your wall that you’re playing the game, and anyone else interested sends you a message with a random number of your choice. Then you take that number and post it in your status update, followed by a compliment or something nice about the person who sent you the number. (i.e. #4736: I think you’re awesome.)
Then people take it from there. They announce that they are playing the game, so do their friends. It spread like fire. It swept Facebook across the country. It’s all over my wall.
Sources): I played there. Rules vary.