Gossip is a type of social behavior present in all types of social networks, and cybergossip is an emerging kind of online social behavior which can both promote and hinder relationships between peers. The aim of this study was to explore the relation between involvement in cybergossip and the development of behavior of social adjustment, bullying and cyberbullying (aggression and victimization), based on gender and age. A total of 510 secondary school students (49.4% girls) aged 12 to 17 years old (M = 14.01; SD = 1.38) were surveyed by self-report. Questionnaires validated with adolescents were used to measure bullying, social adjustment and cyberbullying. The results showed that a high prevalence of involvement in cybergossip was associated with bullying and cyberbullying behavior (aggression and victimization), with girls showing the greatest involvement in cybergossip. The discussion of the results focuses on the gender difference, as well as the importance of the need for training in the proper use of digital devices for social education and socialization.