China’s Twitter-like service Weibo will invest 3% of its annual ad revenue to promote public welfare activities and other social responsibility initiatives, the company’s CEO Wang Gaofei said on Monday at a cyberspace forum held in Beijing. The company made the pledge as Chinese regulators tighten controls on internet companies, with authorities having punished a series of social media platforms including Weibo, Douban, and Zhihu for “illegal information release” in 2021. [Sina Tech, in Chinese]