Even though gaming on Facebook has been around for a while, 2009 was the year of the social gaming boom. Mafia Wars was the first game since Scrabulous to get a nod from mainstream media, and by the end of the year, you’d be hard pressed find anyone — even your Mom — who hasn’t at least heard of FarmVille.

Then there’s the fact that these games are basically cash cows, corralling millions of dollars for Zynga, Playdom, Playfish and CrowdStar (and the prediction that social gaming will be a 5 billion dollar industry in a several years), we’d say this whole social gaming thing has officially taken hold, and we can’t wait to see how these games change in 2010.

Out of the 500+ games on Facebook, five in particular held us captive this year. All of the games on this list launched in ’09 and have 10 million or more monthly active users. It’s equally mind-boggling to sit back and think of how many hours we’ve sunk into these games, not to mention (yup, it’s confession time) how much real-life cash we’ve paid to buy virtual items for these games.

You can read the entire article here. In my opinion, I never played any of these games except Mafia Wars, that too very rare. Farmville and Cafe World are two games that I have started playing in 2010