Buy some corn in FarmVille, and it could fund earthquake relief efforts in HaitiIn recent years, Zynga hasn't exactly been a fount of good news. Since the San Francisco-based gaming company's weak IPO back in 2011, its market share has waned, revenue has shrunk, and management has been forced to lay off staff by the hundreds. Last week, news came that founder Mark Pincus, who was replaced as CEO by Microsoft veteran Don Mattrick last year, was stepping down from his day-to-day duties at the company altogether.