Online social anxiety refers to the negative interpersonal experience such as tension and fear that people perceive in social media platforms,and generally includes three dimensions:privacy concern,interaction anxiety and fear of negative evaluation.It can be studied with qualitative analysis,experimental induction and questionnaires.Prior research indicates that online social anxiety is determined by the characteristics of social media itself,individual characteristic factors,cyberbullying as well as culture.Meanwhile,online social anxiety could also lead to social media burnout,affect the frequency,direction and way of users’ self-disclosure online,and induce online safety behaviors.Future research is expected to develop or revise effective localized scales,explore its psychological mechanisms,pay attention to the possible causes of online social anxiety paradox,and promote the intervention of online social anxiety.