The Internet changes the structure of society all the time โ this massiveness made of individuals.
Ai WeiweiChina didn't want to lose the cutting edge of technology. So the idea of having a Sina Weibo was an attempt to compete with Twitter. However, it has no soul - which is freedom of expression. Nevertheless, I think the government regrets having Sina Weibo, but they cannot shut it down. That would definitely be suicidal.
Ai Weiwei