What is this YoCash of which you speak, Luca?A class action lawsuit filed this week claims that Zynga Game Network, a San Francisco-based company that develops games for Facebook, lured unsuspecting customers into handing over their cell phone and debit card numbers with "special offers" and other irresistible promises. Zynga created games like Mafia Wars, YoVille!, FarmVille, and Poker, which are free to play for social networking site subscribers -- free, that is, until you give away