Screen Time, Social Media, and Adolescent Mental Health: What Science Says and What Policymakers Can Do

Concerns about the impact of screen time and social media on adolescent mental health have prompted rapid policy responses worldwide, including age restrictions, platform regulations, and school-based interventions. However, the scientific evidence presents a far more nuanced picture than public debates typically suggest. Large-scale studies and meta-analyses consistently find that digital media use explains only a small proportion of variation in adolescent mental health outcomes often less than 1% of variance, comparable in magnitude to effects of eating potatoes or wearing eyeglasses. At the same time, risks are not evenly distributed: early adolescent girls and those engaged in image-based platforms may be more vulnerable, particularly through mechanisms such as sleep disruption, social comparison, and cyberbullying. This article reviews current evidence, distinguishes correlation from causation, and highlights key developmental and contextual differences that policymakers frequently overlook. It then examines major policy options including platform design regulation, age verification laws, parental controls, and digital literacy education, outlining their potential benefits and real-world trade-offs. Rather than advocating a single solution, the paper presents a framework for evidence-informed policymaking that emphasizes proportionality, equity, and adaptability. Effective policy should move beyond panic-driven responses toward targeted, developmentally informed strategies that protect adolescents while preserving their rights and access to beneficial digital spaces.