From an article about Sina’s Weibo microblogging service (sort of a ‘Twitter and more’ for China):
The service is much the same as Twitter in that it allows users to post messages of 140 Chinese characters or less via the Web, SMS or MMS.
But 140 Chinese characters can say a lot more, according to tech expert and Beijing resident Kaiser Kuo.
As an aside, turns out that’s not all that Weibo does. There’s also groups, instant messaging with animated emoticons, video and voicemail uploads, location-based, check-ins, a desktop client and (possibly) e-commerce.