Chinese mobile microblog Yidong Weibo has 66m registered users

"Hang Guoqiang, head of China Mobile's mobile internet base and general manager of Guangdong Mobile's data division operations center, recently disclosed that as of May 2011, registered users of the operator's Yidong Weibo ("Mobile Microblog," formerly 139 Shuike) microblogging platform reached 65.85 mln, with monthly active users reaching 14.8 mln, and daily postings reaching 2 mln."

Source:  Sohu IT, via Marbridge Daily, 4th July 2011