https://thenextweb.com/facebook/2018/10/12/facebook-data-breach-details/

Facebook today revealed more information about the September data breach that potentially affected up to 50 million users. Now we know roughly what information the attackers accessed, and the number of people they had access to — as well as a help service for those who were effected.

According to Guy Rosen VP of Product Management (who’s really had to be on the front lines with regards to the multiple security incidents):