Cyberbullying among adolescents has become a worldwide pubhc health problem. The present study, based on a survey of 1103 students ranging from Grade 7 to Grade 11, aims to explore the present cyberbullying on Chinese adolescents' social networking sites, as well as relevant risk factors. The results reveal the following: Cyberbullying is ubiquitous on Chinese adolescents' social networking sites in such major forms of verbal abuse and social exclusion; the time spent visiting social networking sites, the frequency of using these websites, t...