https://thenextweb.com/security/2021/04/05/how-to-check-if-your-account-was-part-of-facebooks-533m-record-leak/

Multiple reports over the weekend confirmed that an attacker published details — including names, user IDs, phone numbers, and emails — of more than 533 million Facebook users on a forum.

Alon Gal, CEO of security firm Hudson Rock, tweeted about the incident back in January, saying that the database came to the fore when a Telegram user made a bot that let users query the database for a fee.