SoftBank Mobile issued a press release this week [in Japanese], announcing that the carriers official Yahoo! mobile portal has added a mobile social networking category to the top level menu. The four sites included — effective immediately — are; MySpace Mobile, Mixi Mobile, GREE and Avex.
Considering the recent news from M:Metrics out of the U.S. it would seem that perhaps the SNS segement has finally hit the big time.. and not just in Japan. If you need to know
more all about this niche then Infinita has the full skinny bundled-up nicely Here.