Zynga in deeper chaos as CEO Mark Pincus resigns again

Last week Zynga was forced to sell its $228m San Francisco headquarters, and after a steady fall in stock its CEO has now stepped down for the second timeMark Pincus has stepped down as CEO of his struggling online gaming company Zynga for the second time. Replacing him is gaming veteran and current Zynga board member Frank Gibeau, the company announced on its blog.Pincus, an affable Silicon Valley character whose wealth is estimated at about $1bn, founded the company seven years ago and first r