one of them. >> although they cost nothing to play, zynga is making some very real bucks. so david wright paid them a visit. >> reporter: farmville. fishville. frontierville. cafe world. mafia wars. all of those games people play on facebook. it's a virtual world i, for one, have refused to enter. >> to be honest i haven't played any of them. >> okay. >> and we'll get to that. >> hopefully that changes. >> reporter: zynga, the company that makes these games and more, are not exactly hurting for players. the company is raking in the cash. and it ain't monopoly money. the internet startup entrepreneur mark pincus named for his dog is not yet a public company which means they don't have to disclose how much money they make. zynga is estimated to be worth more than $5.5 billion. that's billion with a "b". who knew people's idea of fun would be planting virtual strawberries and pumpkins and watching them grow. mark pincus, obviously. >> the key to social games is

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