Hooked, Harmed, and Manipulated: The Harmful Psychological Costs of Social Media for Adolescents

Social media shapes how adolescents form identity, build relationships, and manage mental health. It offers connections and self expression, but its design also creates harm tied to profit-driven features. This paper studies how algorithms push emotional contagion by rewarding extreme reactions, how curated content fuels upward comparison that lowers self-esteem, and how weak safeguards allow cyberbullying to spread without control. The research method is a review of peer-reviewed studies in psychology and sociology. Studies show higher rates of depression, anxiety, and loneliness in adolescents exposed to these risks. Data also connect heavy platform use to reduced sleep, poor focus, and lower academic performance. These outcomes show how design features influence daily health and behavior. The findings give clear action steps. Schools need digital literacy programs to help students see how algorithms shape what they view. Platforms need to redesign features that trap users in harmful loops. Governments need to set standards that hold media companies accountable. This study answers a clear question. How do design choices on social media harm adolescent mental health, and what responses reduce those harms? The evidence shows the risks, and the recommendations provide viable solutions.