Facebook primarily offers basic social networking services so that users can stay in touch with their friends by way of personal messages, wall messages and several other arbit modes. I feel the games are just a source of major revenue for FB, and it also offers entertainment to users to a certain extent. But, to an avid gamer.. these games wont interest them for long and ultimately, they will turn back to the services facebook actually offers. The games definitely make facebook an attractive package, very hard to stay away from because man's need to be social.. and also have fun at the same time fuels this service.