Last week, Google+ took a crucial step towards becoming exactly like Facebook. As of now, there are games available for download within the service, most notably Angry Birds, which is already available on at least one of the devices owned by everyone in America today. Some of the other popular games include Bejeweled Blitz and Zynga Poker, and out of all of the available titles, all come from four companies that have come to form the four-headed dragon of U.S. casual gaming: EA, Zynga, PopCap...