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At Meta, millions of underage users were an 'open secret,' show court filing
(economictimes.com)
This is a most excellent place for technology news and articles.
For age verification specifically, they are supposed to just set a "verified" flag in their database and remove the rest of the data within some amount of time (not more than a month I think).
I wouldn't trust some random nobody to do this, but big companies should have processes that comply with privacy laws.