The idea seems great. Some time ago there was a social network of video games its name was OMGPOP.COM, it was a Facebook that was full of video games similar to classics, like Mario Kart, Tetris and others. With other names clear, you could challenge your friends to a game and even other players. It was a fantastic idea until I closed.
Already the page does not exist and there are now similar attempts but do not reach the quality of omgpop.

Good luck in the project.