Ofcom’s investigation will test whether age-inference systems are enough to protect children from harmful content under the UK’s Online Safety Act.
UK regulator Ofcom has opened an investigation into TikTok’s child-safety systems, examining whether the platform has failed to meet duties under the Online Safety Act to protect children from harmful content.
The Ofcom case notice, published on 16 July, says the investigation concerns TikTok Information Technologies UK Limited and section 12 of the Online Safety Act 2023. The regulator will examine whether TikTok’s systems and processes prevent children from encountering priority harmful content and whether its age assurance is sufficiently effective.
The opening of an investigation does not mean Ofcom has found a breach. It does, however, show that the UK’s online-safety regime has moved from rule-making to enforcement. Ofcom said the first stage will involve formal evidence gathering and analysis, with an update expected in October 2026.
The central technical issue is age assurance. TikTok and other large platforms use a mix of declared age, behavioural signals and automated inference to estimate whether users are children. Ofcom’s concern is that age-inference models may fail to identify a significant number of underage users, leaving them exposed to harmful content.
That question matters beyond TikTok. If behavioural age estimation is judged insufficient, platforms may face pressure to adopt stronger age-verification systems. Those systems can improve protection but also raise privacy, data-security and proportionality questions. Regulators must therefore balance child protection against the risk of creating intrusive identity checks for ordinary users.
The UK framework sits alongside Europe’s wider platform-liability agenda. The EU’s Digital Services Act focuses on systemic risk, transparency, content moderation and protections for minors, while the UK’s Online Safety Act creates its own duties and enforcement route. EU Today has recently covered how European regulators are increasing pressure on large platforms, including through competition and digital-market cases such as Google’s DMA scrutiny.
The TikTok probe is different because it is not primarily about market power. It concerns design, recommendation systems, age controls and exposure to harmful material. That makes it a test of whether platform regulation can move beyond transparency reports and into the underlying architecture of user experience.
Potential penalties are substantial. Ofcom can impose fines of up to £18 million or 10 per cent of qualifying worldwide revenue, whichever is higher, if it finds compliance failures. In the most serious cases, the regulator can seek court orders requiring third parties to disrupt access or services.
TikTok is likely to argue that it invests heavily in safety tools and age-appropriate experiences. The question for Ofcom will not be whether safeguards exist, but whether they meet the statutory threshold of being highly effective.
For Europe, the case will be watched as a practical enforcement benchmark. If Ofcom can show clear evidence and proportionate remedies, it may influence how other regulators assess child-safety duties. If the process becomes bogged down in technical ambiguity, platforms may argue that the law is difficult to apply consistently.
The investigation therefore opens a wider question: how regulators prove that a platform design is safe enough for children when the risk is produced by millions of recommendations, interactions and automated judgments every day.
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