https://www.theguardian.com/technology/2019/sep/04/facebook-users-phone-numbers-privacy-lapse

More than 419m Facebook IDs and phone numbers were stored in an online server that was not password protected, the technology website TechCrunch reported. The dataset included about 133m records for users in the US, 18m records for users in the UK and 50m records for users in Vietnam.