Mark Pincus believes we are in the midst of a "social media revolution." And he's building a business to take advantage of that revolution. After trying to create his own social media site-- Tribe Networks --Pincus now seems content to build on the success of other networks, namely Facebook. Pincus is CEO of Zynga, which creates social network games like Mafia Wars and Farmville . In an interview with Charlie Rose , Pincus said that there are now 66 million "active users" of Farmville. The percentage of people who pay to play the games, or to add special features, is still a small percentage, but Pincus expects revenue to keep climbing. And he's especially bullish on the future of games through mobile phone apps. Here's an excerpt of Pincus on Charlie Rose: Watch the full interview here .