Meta said it was fully expecting many teenagers would try to evade the new measures.

"The more restrictive the experience is, the stronger the theoretical incentive for a teen to try and work around the restriction," Mr Mosseri said.

In response, the company is launching and developing new tools to catch them out.

Instagram already asks for proof of age from teenage users trying to change their listed date of birth to an adult one, and has done since 2022.

Now, as a new measure, if an underage user tries to set up a new Instagram account with an adult date of birth on the same device, the platform will notice and force them to verify their age.

In a statement, the company said it was not sharing all the tools it was using, "because we don't want to give teens an instruction manual".

"So we are working on all these tools, some of them already exist … we need to improve [them] and figure out how to provide protections for those we think are lying about their age," Mr Mosseri said.

The most stubborn category of "age-liars" are underage users who lied about their age at the outset.

But Meta said it was developing AI tools to proactively detect those people by analysing user behaviour, networks and the way they interact with content.

Source.

birthdate of course! everyone knows you can't lie about your birthday!