Adolescents’ social media usage habits and their behaviours on social networking sites and in applications, and the individual and social factors influencing the social media usage and online social networking behaviours.

The focus of the studies is especially on the online aggressive behaviours, such as cyberbullying. Furthermore, the research aims to investigate the individual (developmental), social, and cultural factors influencing these aggressive behaviours, as well as the cyber bystander reactions and the adolescent developmental factors influencing cyber bystanders.