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Australia bans social media for under 16s
(www.theverge.com)
This is a most excellent place for technology news and articles.
Identification would need to be handled by a 3rd party to even remotely work. Then they pass on the "yes they're over 16" tick to the social media platform, with no actual identity details.
Edit: and likewise, Identity company have no details about the social media account name or anything. Just a token transfer of sorts.
I guess Australia.gov can be the site in the middle handing out the tokens
The legislatiion specifically allows SM sites to handle ID.