Twitter has joined Facebook and YouTube in restricting social media accounts of popular dissident Chinese businessman Guo Wengui, in the face of intense Chinese pressure. Guo, a New York-based billionaire and critic of corruption among senior Chinese leaders, said several Twitter accounts he used to reach more than 700,000 followers had been suspended. A Twitter spokeswoman declined to comment citing a policy of not commenting on individual accounts. Earlier, YouTube restricted Guo's live streaming from his widely-watched channel used to post hour-long videos revealing tantalizing details of high-level corruption among Chinese leaders. Guo spent 28 years as an entrepreneur in...