The article refers to the phenomenon of violence on the Internet, known as cyberbullying. It is a crime recently introduced into the Penal Code. Its essence is persistent harassment, which can take many forms and cause dramatic consequences for victims, including suicide. The analysis of police statistics and own research leads to the conclusion that the scale of this phenomenon is growing. Therefore, there is a need for information and preventive actions by young people's guardians - teachers and parents, because the most dangerous effects of online violence may concern children and adolescents. Traumas affecting young people have particularly strong negative consequences for the development of the psyche.