Microblogging site Sina Weibo, China's answer to Twitter, reported a pretty dazzling statistic in its third quarter results: it now boasts over 400 million registered users. We can't be sure how many are active, of course, but it's still a vast number considering appeal is localized to the People's Republic. It also means Sina is winning the popularity contest with social media competitor Tencent, although it humbly acknowledges their services are somewhat different. The company's platform is still evolving, and it's only recently seen mobile usage exceed computers, so is shifting product focus accordingly. Sina's obviously doing something right, and that suits us just fine -- keep those news bites and juicy leaks coming.