GREE is a social gaming company based in Japan that has acquired OpenFeint for $104 million. OpenFeint is a platform where mobile device owners can track their scores and buy add-ons. The OpenFeint brand and CEO will remain in place after the acquisition is closed. OpenFeint currently has about 75 million users across Android and iOS. [Develop]

Even though Facebook is one of the biggest websites in the United States, it is barely noticed in Japan. Facebook added their 583 millionth member recently and less than 2% of those in Japan have an account. The number of Facebook users in Japan is 2 million, which is still not a bad number. So what social networks are people a part of in Japan? Mixi, Gree, and Mobage-town. Each of these social networks have over 20 million users in Japan.