The rapid growth of digital technologies in recent decades, especially social networks, has fundamentally transformed the communication, educational, and recreational patterns of adolescents. This study, focusing on high school students, examines the impact of extensive use of platforms such as Instagram, TikTok, Telegram, and WhatsApp on their mental health. Global and local findings indicate that excessive use of social media is significantly associated with increased symptoms of anxiety, depression, feelings of isolation, academic failure, sleep disorders, and decreased self-esteem in adolescents. Considering the sensitive characteristics of adolescence in the formation of identity and the development of interpersonal skills, monitoring and managing social media use is of particular importance.This study, utilizing modern research literature and field evidence, analyzes the psychosocial consequences of using social networks and provides practical suggestions for preventive and supportive interventions at the family and school levels.