Data includes full names, Facebook IDs, mobile numbers, locations, email addresses, gender, occupation, city, country, marital status broken, account creation date, and other profile details. Also included in the leak are phone numbers from Facebook CEO Mark Zuckerberg, co-founders Chris Hughes, and Dustin Moskovitz, who are the fourth, fifth, and sixth members to have registered on Facebook. The data was obtained by exploiting a vulnerability that enabled automated scripts to scrape Facebook profiles and associated private phone numbers en masse.
Source: https://thehackernews.com/2021/04/533-million-facebook-users-phone.html