Games.com say 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,…