You can try famrville for a starter and after you get tired of it, try Frontierville or at the same time play Cityville and petville. If you love role playing as having a place of your own, try Yoville. Facebook is so popular because of its game applications that can really enticed people to stop working and just play and be engrossed in a victual world far far from their real life.
i use application that can automaticly update on my status when i make some posting at myblog.. it's very useful for promoting my blog.. my friends can get some update for my blog