New Delhi, June 2 -- Malaysia on Monday began enforcing rules barring millions of children younger than 16 from having social media accounts, joining a growing global effort to tighten safety protections. Not all families approved, and critics raised concerns about data protection and potential surveillance.

Social media platforms with at least 8 million users in Malaysia, including Facebook, Instagram, TikTok and YouTube, must implement age-verification systems and block users under 16 from creating accounts.

Malaysia's Communications and Multimedia Commission said age verification for existing users will be rolled out over the next six months. Users identified as under 16 will have a month to download or transfer data, including photo...