Sina Weibo began internal testing on August 14, 2009. On September 25, Sina Weibo officially added the @ function and private message function, in addition to the "comment" and "retweet" functions for users to communicate.

On average, Sina Weibo users post over 100 million pieces of Weibo content per day. In addition to the web version, Sina Weibo also has a local client version, the current mainstream ones are Weibo AIR, Wing Weibo, Microwave, etc. Sina Weibo has also launched an official local desktop client - Weibo Desktop.

At 10:20 on December 1, 2010, Sina Weibo has an inaccessible failure, some users have the phenomenon of "user does not exist", the microblogging system requires the filling in of personal information, and forced to quit. The Sina Weibo interview resumed normal at 14:30 that day, and officials explained the incident as a result of a surge in Sina Weibo user volume and daily Weibo posts. Sogoo CEO Wang Xiaochuan said the incident was caused by the microblogging server entering a dead-cycle process, causing it to automatically jump to the system error page after entering the home page and then automatically jump to the home page again four seconds later; this caused a huge impact on the server, which caused it to crash.

On March 2, 2011, Sina CEO Cao Guowei said that the number of registered users of Sina Weibo has exceeded 100 million. At the same time, he also revealed that Sina will at least double the 600-person headcount of its Weibo department and significantly increase its marketing spending on Weibo.