Britain is drawing a hard line on kids and social media. The UK government announced it will ban children under 16 from using a range of major apps — including TikTok, YouTube, Snapchat, Facebook and X — to protect young people from harmful content and excessive screen time. The sweeping move, fiercely contested by tech giants, makes the UK a leader in a fast-growing global push to tighten online safety for children.The ban's scopeIt is broad and strict. Prime Minister Keir Starmer announced that some 10 social media platforms will be completely off-limits to under-16s, with the legislation going further than Australia's world-first ban by adding curfews for older teens and restrictions on AI chatbots. The measure targets the platforms where young people spend much of their time.Why the government actedChild safety is the driver. Officials cite concerns over harmful content, mental health and excessive screen time among young users. The ban reflects mounting political and public pressure to shield children from the documented risks of social media, even at the cost of restricting access.Tech pushes backThe platforms are fighting it. Meta warned that bans risk isolating teens and driving them to unregulated alternatives lacking safety features and parental controls, while Snap argued an outright ban may simply push teens to less safe platforms. TikTok pointed to its dozens of built-in teen safety settings.A global movementThe UK is not alone. The move makes Britain part of a growing wave of countries tightening online protections for children, following Australia's pioneering ban. As more governments act, the pressure on social media companies to address youth safety is intensifying worldwide.Enforcement questionsThe challenge is real. Verifying ages and enforcing a ban across global platforms raises thorny practical and privacy questions. How the UK implements age checks without creating new risks will be closely watched, and the answers could shape similar efforts elsewhere.Why it mattersThe stakes reach beyond Britain. The ban tests whether governments can rein in the role of social media in children's lives and sets a precedent others may follow. It also forces a reckoning over platform responsibility, free access and the balance between protection and connection in the digital age.The bottom lineBritain is moving to ban under-16s from major social media apps including TikTok, YouTube and Snapchat, going further than any country before with curfews and AI chatbot limits. Tech giants are pushing back hard, warning of unintended consequences. As part of a global movement, the UK's ban could reshape how children experience the internet.