Instagram is overhauling the way it works for teenagers, promising more “built-in protections” for young people and added controls and reassurance for parents.

The new “teen accounts” are being introduced from Tuesday in the UK, US, Canada and Australia.

They will turn many privacy settings on by default for all under 18s, including making their content unviewable to people who don’t follow them, and making them actively approve all new followers.

But children aged 13 to 15 will only be able to adjust the settings by adding a parent or guardian to their account.