Longitudinal Canadian Study Links Extra Social Media Hour to 15% Higher Teen Depression Odds, Strongest in Girls

Researchers drew repeated measures from the COMPASS cohort across five provinces, tracking 27,000 youths aged 12-18 from 2021-2023. They measured self-reported daily social media time against validated scales for depression, anxiety, emotional regulation, and interpersonal functioning, observing within-person changes rather than cross-sectional snapshots. Associations held after controlling for baseline mental health, yet the design cannot separate selection effects from causal influence.

Girls showed the steepest gradients, consistent with prior patterns in which social comparison and body-image pathways amplify risk; gender-diverse youth also reported elevated baseline symptoms. The study notes that rising use from one year to the next predicted poorer outcomes across all groups, supporting calls for the proposed Safe Social Media Act restricting access under age 16.

Earlier work, including Orben et al. (Nature Human Behaviour, 2019) and Twenge et al. (Clinical Psychological Science, 2017), documented similar associations but relied more on cross-sectional or shorter panels; the current longitudinal evidence strengthens temporal ordering yet leaves mechanisms and active-versus-passive use unmeasured. Policy impact will hinge on whether restrictions reduce total exposure or merely shift platforms.

Next steps require app-specific usage logs and randomized or quasi-experimental evaluations of age-gate enforcement to test whether reduced screen time translates into measurable clinical improvement within 18-24 months.