Surely you could have a trusted age verifier (perhaps a non-profit open source platform) that has the legal responsibility to verify age (via credit-card or pho

Surely you could have a trusted age verifier (perhaps a non-profit open source platform) that has the legal responsibility to verify age (via credit-card or photo or gov id or some other way). Then you can have something like an oauth flow, except the only piece of identity it exchanges is the is18? boolean field. One has to realise that for social media their networks effects are both their biggest strengths and their biggest weaknesses. Unlike for things like gaming or porn where there is a relatively large problem (i.e. 20%) if you manage to block only 80% of illegitimate access, for social media if suddenly 80% of the network disappears, than the incentive for the remaining 20% to keep coming drastically decreases.