The Problematic Use (PU) of Social Networking Sites (SNS) is a diagnostic and preventive as well as educational challenge. Problematic Use of new media is currently a phenomenon discussed by psychologists, sociologists, and media educators in the field of diagnosing the scale of the phenomenon, as well as protective factors and risks related to this phenomenon. This text is part of the debate on the scale of SNS among young people, as well as on the role of parents in reducing this phenomenon. The text also juxtaposes issues related to the prediction of PU SNS and risk behaviours in the offline space. The study employed a triangulation of quantitative tools in the form of: frequency of SNS use, parental control online, and scale of psychoactive substance use. Based on the data collected among a group of adolescents in the Czech Republic (N = 531 individuals aged 13-19 years, study year 2018/2019), it was noted that: 1) Almost 75% of adolescents systematically use SNS before bedtime; 2) Every fifth adolescent consumes dinner daily or almost daily accompanied by SNS; 3) Less than a third of respondents use SNS almost continuously; 4) SNS UI indicators are mutually related; however, the relationship is not always strong; 5) Girls have a slightly higher level of PU SNS than boys; 6) Systematic alcohol consumption is a predictor of PU SNS; 7) Parental restriction of Internet use time leads to a reduction in PU SNS among adolescents
