Platform‑specific teen experience profiles

Teens do not use social media as a single monolith — TikTok, Instagram and Snapchat each serve distinct social and informational roles and carry different risk profiles (e.g., TikTok for entertainment and product reviews; Snapchat for friend messaging). Policy, parental guidance, and research should therefore move from 'social media' as one object to platform‑level profiles that guide interventions and measurement. — Framing teens' online lives by platform rather than by aggregate screen time shifts regulation, design standards, and parental strategies toward more targeted and effective actions.