The personal data of 533 million Facebook users were in the public domain. Among the victims are the social network's founders Mark Zuckerberg, Chris Hughes, and Dustin Moskovitz.

The disclosed data includes the personal information of over 533 million Facebook users from 106 countries. These include full names, geolocations, dates of birth, biographical information, phone numbers, Facebook IDs, and, in some cases, even email addresses.

The creator of the Have I Been Pwned database, Troy Hunt, explained that the most important information for fraudsters is not email addresses, of which there were only 2,5 million, but phone numbers.

There are many services these days that require just a phone number. Due to Facebook's leak, hundreds of millions of contacts are conveniently categorized by country with complete names and gender.

Facebook told reporters that this data was stolen due to a vulnerability that was fixed in 2019. The company can do nothing but inform users about what happened.

You can use the Have I Been Pwned service to check if your information leaked. The site only searches for data by mail. Hunt thinks that the risk for those whose data has been hacked outweighs the potential value, and therefore is in no hurry to add the ability to search by phone number.