A database exposing the names, phone numbers and Facebook user IDs of millions of platform users was left unsecured on the web for nearly two weeks before it was removed. The data was also posted to a hacker forum as a download on Dec. 12. The affected Facebook users in the database were mostly from the U.S., according to researchers. Researchers warn Facebook users to adjust their privacy settings to private instead of public, decreasing the chances of their profiles being scraped by third parties.
Source: https://threatpost.com/267m-facebook-phone-numbers-exposed-online/151327/