Many adolescents have experienced cyberhate, as witnesses, victims and/or perpetrators. This has profound negative effects on their wellbeing, and potentially lead to acts of violence and social fragmentation. This project examines who is vulnerable to cyberhate victimization and perpetration (Study 1), how it develops (Study 2), under what circumstances cyberhate becomes more likely (Study 3), and what can be done about it in schools (Study 4). The projects results will generate important new knowledge on the understudied topic of cyberhate, which can help generate solutions for preventing and solving this global issue.