Ren Zhiqiang is a retired Chinese real estate tycoon, a member of the Beijing Municipal Committee of the Chinese People's Political Consultative Conference, and a blogger on Sina Weibo with 38 million followers. Nicknamed "Big Gun Ren", he is known for his outspoken criticism of the Communist Party. [https://en.wikipedia.org/wiki/Ren_Zhiqiang ]
CAC (Cyber Space Administration of China) today requested Sina and Tencent close down his weibo accounts. In addition, the CAC claimed on CCTV that Ren Zhiqiang published illegal information on Weibo. [http://news.sina.cn/gn/2016-02-28/detail-ifxpvysx1726031.d.html?vt=4&pos=108]
This is noteworthy because Ren Zhiqiang as a powerful individual in China has never get his accounts blocked before despite his sharp criticism against the Chinese government. His weibo is regularly censored however. Most weibo account blocking happens in the dark without any notice. This is one of the few times where an account blocking is publicly announced by the censorship authority.
A similar event happened last time in 2013. CAC publicly suspended weibo account of He Bing (何兵), the vice president of China University of Political Science and Law, for spreading rumors. [http://news.xinhuanet.com/politics/2013-05/10/c_115711107.htm]