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In March 2014, Sina Corporation announced a spinoff of Sina Weibo as a separate entity called simply "Weibo", and filed an IPO under the symbol WB. Sina carved out 11% of Weibo in the IPO, with Alibaba owning 32% post-IPO. The company began trading publicly on 17 April 2014. In March 2017, Sina launched Sina Weibo International Version. In November 2018, Sina Weibo suspended its registration function for minors under the age of 14. In July 2019, Sina Weibo announced that it would launch a two-month campaign to clean up pornographic and vulgar information, named "Project Deep Blue" (蔚蓝计划). On 29 September 2020, the company announced to go private again due to rising tensions between the US and China. Sina Weibo had gone public on the Nasdaq in 2000. In June 2020, Sina Weibo reached 523 million active monthly users. Sina Weibo has attracted criticism over censoring its users.