The guys over at Rounds have been researching a lot around the social networking gaming industry, and they created a truly awesome and informative infographic about the evolution of social gaming.This infographic will take you from the early stages of gaming in 1972 to today’s billion dollar gaming industry, and all within this infographic. One of the most successful social media games is of course FarmVille, but there are countless of other games that are bagging money by the boatload. If you have ever played a social game, you know exactly how addictive those games are. That is exactly why social gaming is such a huge industry. What would you say are the most addictive social games and why do you think you keep playing them? Have a look at the infographic below, and click to enlarge it.