The increasing development of technology is changing children's lifestyle and they spend more and more of their free time on the Internet and various websites. The Internet along with social networks, offers children a multitude of possibilities for communication and interaction and those interactions are usually hard to control. Along with many advantages of the Internet there are also some disadvantages. With the development of technology, a new form of peer violence is emerging - cyberbullying or peer electronic violence, which is becoming more and more common problem faced by children, parents, and teachers. This work analyzes the concept of peer violence, its forms, and the roles played by participants in the circle of peer violence. Furthermore, the dangers of the Internet and dangerous places of the Internet that threaten children are analyzed, and advice for the protection of children on the Internet is offered. The paper analyzes the concept of peer electronic violence as well as its forms, consequences, and roles that children play in the circle of peer electronic violence. Peer electronic violence prevention programs in Croatia are presented as well as the roles that students, parents, and teachers play in the prevention of peer violence.