Cyber space has enabled numerous social activities. The internet has become necessary for all spheres of life and an important element of social, political, and economic development. The world is more networked and connected than ever, with countless cyber possibilities. Children and young people are growing up with the use of information and communication technologies and the widely available internet. However, with numerous cyber activities, cyber security threats and challenges including cyber violence are also growing. The goal of the chapter is to show the negative sides of the internet and how risky the behavior of young people on social networks, which create certain social patterns of behavior, is. The importance of cyber security is not only related to cyber wars and crime, but also seriously affects personal (i.e., human) security and, above all, the security of young people.