Adolescents in today's world cannot imagine life without social networks, they are an integral part of their everyday life, and therefore play a big role in all the developmental processes that adolescents go through. The aim of this thesis was to get an insight into the perspective of professionals working in centres for social care about the different roles of social networks in adolescents’ lives. Seven professionals participated in the study, three of whom are social workers, two psychologists and two social pedagogues. The first research question examines how social networks are considered in the work of professionals employed in the centre for social care. In their answers, the participants state that the topic of social networks is an integral part of working with both parents and adolescents, and they also emphasize the importance of personal familiarity with social networks, which contributes to a sense of professional competence and facilitates communication with users. The second research question seeks to find out what effects social networks have on the life of adolescents from the perspective of professionals. The answers reveal health consequences, consequences in the context of psychosocial development and the consequences for the general well-being of adolescents as the most recognizable. The third research question examines the professionals’ perception of the role of COVID-19 virus in the context of social networks usage by adolescents. The results show that there were changes in the habits of using social networks during the pandemic, and the importance of the social networks’ effects on mental health and for the adolescents’ socialization are also emphasized.