Facebook will not notify more than 530m users exposed in 2019 breach
https://www.theguardian.com/technology/2021/apr/08/facebook-2019-breach-users
Company spokesperson said Facebook was not confident it had full visibility on which users would need to be alerted
Facebook has not notified the more-than 530m users whose details were exposed on a hacker forum in 2019 and has no plans to do so, according to company representatives.