Social games maker Zynga moves one step closer to world domination, minting its own currency, the zCoin. In short, play games like FarmVille, FrontierVille, Mafia Wars, Zynga Poker and more, earn zPoints, cash those in for zCoins and grab exclusive items from RewardVille. The move comes months ahead of Facebook's requirement that all social games use Facebook Credits for payment. [AllThingsD]