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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.
It does not absolve Meta from not doing due diligence. They have means to make an effort at it and plenty money to hire some experts. Kids under 13 upload their photos to FB publically and would likely be spotted as at least underage in normal conversation if Meta rep reached out to them. They could require reports to come from verified users and disregard reports from users with bad track record.