Zynga CEO Mark Pincus was a four-time entrepreneur with no experience in the game industry. Yet in five short years, he has created a game industry giant with dedicated users. Zynga has doubled its revenues this year. Today it holds the top five games on Facebook DAU: CityVille (10,110,000), CastleVille (8,100,000) and FarmVille (7,200,000),...