Sina launched Sina Weibo.
Sina Weibo experienced an outage,
Sina Weibo and Alibaba China signed a strategic cooperation agreement.
Sina officially announced that Sina Weibo had signed a strategic cooperation agreement with Alibaba.
Alibaba Group acquired 18% of Sina Weibo.
Sina Corporation announced a spinoff of Weibo as a separate entity.
Sina launched Sina Weibo International Version.
Sina Weibo had 413 million active users.
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.