As a result of technological changes, the Internet and ICT-tools have become available to almost anyone, and the usage among young people is nearly continuous. Therefore, the communication habits of young people have changed, and they also face the dangers of the digital world. This risk can be internet addiction, deception, or cyber-bullying. In our paper, we have focused on cyber-bullying. Firstly, we analyze the effects of digital transformation. Later on, we present the dangers of cyber-bullying by using large-scale research results. Thereafter, we describe the possibilities of child protection in dealing with and preventing this problem.