https://www.reuters.com/article/us-facebook-data-leak/facebook-does-not-plan-to-notify-half-billion-users-affected-by-data-leak-idUSKBN2BU2ZY

Facebook Inc did not notify the more than 530 million users whose details were obtained through the misuse of a feature before 2019 and recently made public in a database, and does not currently have plans to do so, a company spokesman said on Wednesday.