http://www.washingtonpost.com/blogs/the-switch/wp/2018/03/20/ftc-opens-investigation-into-facebook-after-cambridge-analytica-scrapes-millions-of-users-personal-information/

The Federal Trade Commission has opened an investigation into Facebook following reports that a data analytics firm that had worked with the Trump campaign had improperly accessed names, “likes” and other personal information about tens of millions of the social site’s users without their knowledge.

The FTC probe – confirmed by a source familiar with the agency's thinking and not authorized to speak on the record -- marks the most substantial political and legal threat yet to Facebook as it grapples with the fallout from Cambridge Analytica and its controversial tactics. And it could result in the U.S. government slapping Facebook with a massive fine.