Mixi might not be any more the main social network in Japan. Mobage, an only-mobile network based on gaming and launched just one year ago, has more users than Mixi. 75% of Japanese only access these sites from their smartphones. People in Japan don’t like Facebook as they are very privacy-conscious.

These are the top social networks in Japan right now, according to Asiajin:
1. Mobage (both Yahoo! Mobage for PC and Mobage Twon for mobile)
2. Gree (only mobile gaming, registration requires a Japanese cell phone number, makes money from virtual goods)
3. Mixi (very similar to Facebook, but uses nicknames instead of real names, makes money out of ads and registration requires a Japanese cell phone number)
4. Twitter
5. Facebook