The paper presents and discusses outcomes of the first stage of a research project on the role of social media in the life of modern adolescents that was carried out on basis of the MSUPE Centre for Interdisciplinary Research on Modern Childhood in 2015—2018. The issue of adolescents’ self-presentation in social media is one of the key trends in modern research, and in Russian psychological and pedagogical science there is clearly a lack of works on various aspects of adolescent online behaviour and interaction, in particular, in social media websites. The sample of our empirical study consisted of 88 individuals aged 15—18 years, and the following techniques were used: a modified version of A.Ye. Lichko’s character accentuations questionna...