The operator of China’s second-most popular short video app, Kuaishou Technology, and microblogging platform Weibo came under scrutiny from the nation’s top internet regulator for allegedly “damaging the online ecosystem” due to lax content control. Kuaishou and Weibo had failed to manage content effectively, allowing celebrity gossip to infiltrate their trending topics, according to two notices published on the Cyberspace Administration of China (CAC)’s WeChat public account on Saturday. The...