“All available evidence converges on a single narrative: heavy, mobile-first social-media use is correlated with declining well-being, especially for adolescents. No counter-claims surfaced, so there is no live divergence to reconcile—the system is internally consistent. Given the breadth of supporting claims and their stability scores (most ≥0.7), we assign an overall risk posture of Moderate-High: the threat to youth mental health is credible and likely growing, but quantitative certainty is limited by the absence of machine, map, and mechanics pillars, which could either reinforce or attenuate the assessment.”