2009
14
August
Sina launched Sina Weibo.
2010
01
December
Sina Weibo experienced an outage,
2013
01
January
Sina Weibo and Alibaba China signed a strategic cooperation agreement.
2013
01
April
Sina officially announced that Sina Weibo had signed a strategic cooperation agreement with Alibaba.
2013
09
April
Alibaba Group acquired 18% of Sina Weibo.
2014
01
March
Sina Corporation announced a spinoff of Weibo as a separate entity.
2017
01
March
Sina launched Sina Weibo International Version.
2018
01
June
Sina Weibo had 413 million active users.
2018
01
November
Sina Weibo suspended its registration function for minors under the age of 14.
Sina Weibo announced that it would launch a two-month campaign to clean up pornographic and vulgar information.