When I think of social games, Bingo is one of the last things that comes to mind. With the exception of the caller bellowing out the numbers, bingo halls are usually as silent as a library. People are so focussed on their own cards and their own numbers that they won't let even the simplest moment break their concentration. And yet Bingo has come to Facebook - the internet's home for everything social. Not only does Bingo embrace this social phenomenon, it does so with a tremendous degree of success.