Would value FarmVille creator at $20B
                                
                                
                                    (Newser) -
                                    Zynga, the gaming company behind such Facebook behemoths as FarmVille and CityVille, is poised for an IPO that could raise as much as $2 billion—which would turn it into a $20 billion company, reports  Reuters . Analysts expect Zynga, with 215 million active monthly users, to file its paperwork today...