The Short Version
The claim is partially true but overstated. Peer-reviewed research confirms social media platforms use engagement-maximizing features — infinite scroll, algorithmic personalization, dopamine-driven feedback loops — that produce addiction-like behaviors in adolescents. However, the claim that these features were "deliberately designed to be addictive for children" specifically implies proven, child-targeted intent that goes beyond what current evidence establishes. Legal cases alleging this remain unresolved, companies deny the characterization, and the documented designs target all users' engagement, not children specifically.