2012 smartphone inflection for teen mental health

Widespread smartphone and social‑media adoption around 2012 produced a durable change in how teens use their time—less in‑person socializing and sleep and more constant online engagement—which plausibly accounts for a notable rise in teen depression and anxiety over the past decade. — If true, the claim reframes youth mental‑health policy from individual therapy toward structural interventions (platform design, age limits, school schedules, and sleep policy) and gives a clear temporal marker for accountability and regulation.