Sina Weibo the domestic microblogging services including the first weibo service Fanfou. Many popular non-China-based microblogging services like Twitter, Facebook, and Plurk have been blocked from viewing since then. Sina's CEO Charles Chao considered this to be an opportunity. SINA Corporation launched the tested version of Sina Weibo on 14 August 2009. Basic functions including message, private message, comment and re-post were made possible in September 2009. A Sina Weibo–compatible API platform for developing third-party applications was launched on 28 July 2010. On 1 December 2010, the website experienced an outage, which administrators later said was due to the increasing numbers of
Tencent Weibo of QQ, Tencent doesn't intend to launch Tencent Weibo at a strategic level, but as a marketing tactic to curb competitors. Many celebrities are Tencent Weibo users, including, Ma Huateng, Zhou Hongyi, Liu Xiang and Jet Li. Initially only QQ users could register Tencent Weibo account corresponding to their own QQ number. Weibo accounts are not automatically registered for QQ users, they need to log in Tencent Weibo page for registration. Email address can be used for registration (formerly only QQ email address were supported). Posts can be shortened into an url.cn domain name. Each user can follow up to