Social media have become the major media used by the general public to obtain news and information. However，adverse events such as leakage of personal information and vulgar content occur frequently in social media，while the tools used by public power to regulate such events are unitary and lagging behind the development of social media. China should introduce the system of third-party participation into the institutional design of social media management and activate user autonomy，so as to increase the responsibility of users as disseminators of news. Based on the public interest principle，the government should restrict the power of platforms in accordance with due procedure and the principle of proportionality while at the same time establish clear standard on the censorship of news by public power. Meanwhile，it should attach high importance to the role played by algorithms in the dissemination of news in social media and conduct technological regulation of the algorithms of social media.