Multiple longitudinal and cross-sectional studies report a dose-response gradient in which adolescent girls who use social media heavily report higher rates of depressive symptoms, anxiety, and lower well-being than light users, with the gradient steepening above roughly two to three hours of daily use.

TODO: summarize the strongest dose-response findings — the female-skew gradient, the steepening past 2–3 hours/day, replication across cohorts — and address the obvious confound (kids who already feel bad use phones more).

• The post-2012 rise in adolescent depression and self-harm is concentrated in girls, and the platforms whose adoption coincides with the inflection are image-based and comparison-driven.

These are challenges this argument’s reasoning pattern must still withstand. Answering them on Isonomia strengthens the argument.

• Could a different cause produce the same effect E in this case?Open
• Is there a plausible causal mechanism by which C could bring about E?Open
• How strong is the causal generalization linking C to E? Are there documented cases where C does not produce E?Open
• Are there intervening or confounding factors that could interfere with the causal chain from C to E?Open
• Is the apparent link between C and E merely a post hoc correlation rather than a causal relation?Open

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