Social media age limits in the UK, the four apps.
Short answer. WhatsApp, TikTok, Instagram and Snapchat all set their minimum UK age at 13. None verify age effectively. The published parent and clinician evidence, where it is strongest, recommends delaying all four until at least 16 for girls in particular. The simplest way to enforce this at home is to delay the smartphone.
What each platform actually says
WhatsApp. Minimum age 13 in the UK and EU (raised from 16 in 2023). Owned by Meta. No age verification at sign-up; the child types in a date of birth. End-to-end encrypted by default.
TikTok. Minimum age 13. Owned by ByteDance. Age is self-declared at sign-up. A separate "Under 13" experience exists in some regions but is not on by default in the UK.
Instagram. Minimum age 13. Owned by Meta. Teen Accounts (introduced in 2024 for 13 to 17s) tighten the defaults, but the underlying minimum age is still 13.
Snapchat. Minimum age 13. Owned by Snap Inc. Snap Map (location) and Snapstreaks are on by default at sign-up. Family Center offers parent visibility but requires both the parent and child to install Snapchat on their phones.
What the Online Safety Act 2023 requires
The Act places duties on social media platforms operating in the UK to protect children, including age-appropriate access, content moderation, default settings for under-18s and clearer reporting routes. Ofcom is implementing the specifics through 2025 and 2026. The Act does not raise the minimum age above the platform terms, but it does require platforms to take meaningful age-appropriate steps for any user under 18. The full parent explainer (what the children's safety duties from 25 July 2025 mean, what Ofcom now requires of platforms, why the practical decision still sits with parents) is at /notes/online-safety-act-children-explained.
What the published evidence recommends
The Anxious Generation by Jonathan Haidt argues for a delay-until-16 norm for all four apps, with the strongest evidence for girls. The 2024 Ofcom Online Nation report documents the prevalence and patterns of use, without making age recommendations. The Royal Society for Public Health's 2017 "#StatusOfMind" report ranked Instagram and Snapchat as the most harmful to teenage mental health. The 2024 Lancet Psychiatry review found the strongest causal-direction evidence for social media's role in adolescent mental-health symptoms in girls aged 11 to 13.
Knock's position: the evidence is correlational, not proven causal, but the direction is consistent enough that delaying all four apps until at least 16 for girls (and 14 to 16 for boys) is the defensible call. The plain-English read of the research is at /the-risks.
Why delaying the smartphone is the simplest way to enforce a delay on social media
The four apps live on a smartphone. The Nokia 3210, the Nokia 235, the Nokia 2660 Flip and the Nokia 105 4G cannot run any of them. The Light Phone III cannot run any of them. The Pinwheel Plus and the refurbished iPhone SE can, but only inside the parental-control rails the parent chooses to allow. The single most effective home rule is: no smartphone yet, no social media yet. The conversation script for the kitchen-table version of that decision is at /switching-kit.
What to do if your child already has social media on their phone
Two routes. The hard reset: step back to a basic phone, sell or store the smartphone, and reset friend-network expectations. The full piece is at /notes/05-stepping-back-from-smartphone. The soft reset: keep the smartphone, set up Apple Screen Time properly, delete the four apps, and set Communication Limits to Contacts Only. Both work; the hard reset is harder in week one and easier from month two.
Four short answers.
What age can a child use WhatsApp in the UK?
WhatsApp's terms of service set the minimum age at 13 in the UK and EU. In practice WhatsApp does not verify age, so children under 13 do use it. Our position: if your child does not have a smartphone, they do not have WhatsApp. The friend-network workaround for a basic-phone family is at /notes/03-replacing-whatsapp.
What age can a child use TikTok, Instagram or Snapchat in the UK?
All three set their minimum age at 13 in the UK. None verify age effectively. The published parent and clinician evidence (the Anxious Generation, Ofcom Online Nation 2024, the Royal Society for Public Health) is most consistent on this: keep all three off the phone until at least 16, particularly for girls, where the mental-health signal is strongest in the published research.
Is the UK Online Safety Act about social media age verification?
Partly. The Online Safety Act 2023 places duties on social media platforms to protect children, including age-appropriate access, content moderation and reporting. The age-verification specifics are still being implemented by Ofcom through 2025-26. The Act does not set a higher minimum age than the platform terms (13), but it does require platforms to take age-appropriate steps for under-18s.
How do I keep my child off social media if their friends are on it?
The single most useful move is to delay the smartphone, because the smartphone is the device that brings social media into the bedroom. The Nokia 3210 cannot run TikTok, Instagram, Snapchat or WhatsApp. The friend-network briefing at /switching-kit is the paragraph designed to make the conversation with other UK parents about delaying smartphones together easier.
