Who would have thought that growing tomatoes, pumpkins and artichokes could be as addictive but that was the power of social gaming. Now as the platform matures, there have been more engaging games that have emerged on the scene. We present you a list of top 10 games that were launched on Facebook in 2012. The rankings are based on user ratings and engagement with the games. It's the same methodology that Facebook uses to rank apps in its App Center.