This master’s thesis aims to examine the relationship between the use of social networks and physical self-perception of adolescents. This thesis was written within the project “Testing the 5C model of positive youth development: traditional and digital mobile measurement (P.R.O.T.E.C.T.) funded by the founding support of the Croatian Science Foundation, implemented by the Faculty of Education and Rehabilitation Sciences. In order to examine the described constructs, the 5C scale of positive development was used, especially the subscale that examines self-perception (Geldhof et al., 2014), and the Questionnaire on problematic use of social networks (adapted according to Jovičić-Burić et al., 2021). A short version of the Positive Youth Development Questionnaire – short form, PYD-SF; Geldhof et al., 2014) was used in order to examine positive developmental characteristics of the youth, and the Scale of problematic use of social networks (Jovičić Burić et al., 2021) was used to assess problematic/excessive use of social networks among adolescents. For research purposes as part of this thesis, a sample of 350 adolescents was selected, comprising 170 young men and 165 young women, while 15 adolescents did not want to declare their gender. Research results showed the dispersion of adolescents in all risky categories of using social networks, and as much as one fourth of the examinees belong to the category of risky users. Furthermore, the findings showed that increased risky use of social networks among both male and female students results in decreased satisfaction with themselves. On the other hand, it was shown that students' self-awareness and acceptance of their own bodies and perception of good looks do not depend on the riskiness of the use of social networks. The opinion of both male and female adolescents on their own good locks does not depend on the frequency and riskiness of the use of social networks. The results showed that adolescent boys who use social networks in more risky manners on average show lower levels of self-awareness and lower satisfaction with themselves, while for adolescent girls these corelations did not prove to be statistically significant.