https://www.theregister.co.uk/2018/04/17/facebook_admits_to_tracking_non_users/

Facebook's apology-and-explanation machine grinds on, with The Social Network™ posting detail on one of its most controversial activities – how it tracks people who don't use Facebook.

The company explained that the post is a partial response to questions CEO Mark Zuckerberg was unable to answer during his senate and Congressional hearings.