A solution I would be very OK with is the following: * Enforce the age limits only on smartphones and tablets. This solves >95% of the problem and still leaves

A solution I would be very OK with is the following: * Enforce the age limits only on smartphones and tablets. This solves >95% of the problem and still leaves a way for people to be anonymous. * Smartphone OS vendors come up with a common age verification framework that's based on zero knowledge proofs constructed over the electronic certificate in your passport - there are already working PoCs of this on Github * Each identity can only be installed on one device at a time. Then parents cannot share identity with kids (unless the parents completely give up on all social media) * For people who don't have a passport, offer a manual and thorough process for age verification, after which you get issued a small plastic card with identity certificate readable by NFC.