Screens Displace Teen Social Life

New multi‑method evidence suggests the smartphone era (around 2012) reengineered how teens spend non‑school time: social‑media use surged, in‑person hanging out and sleep fell, and several study designs now point to a plausible causal link with rising teen depression and anxiety. The claim is not merely correlation: experiments and natural experiments (time‑use, polls, and quasi‑random exposures) converge on the displacement pathway — screens crowding out real social contact and restorative sleep. — If screens are displacing face‑to‑face time and sleep and contributing to youth mental‑health declines, that justifies policy action on age‑checks, school schedules, platform design, and mental‑health funding targeted at adolescents.