Zynga Files $1 Billion IPO Fueled by Virtual Farms, Mob Wars 3.80K Kotaku 07/01/11 12:10PM Filed to: the markets the markets Republished Zynga, the game makers behind mega Facebook games Farmville, CityVille and Mafia Wars today filed papers with the Securities and Exchange Commission to take Zynga public in hopes of raising $1 billion. [Kotaku]