" The FTC [US Federal Trade Commission] takes very seriously recent press reports raising substantial concerns about the privacy practices of Facebook,” said Tom Pahl, acting director of the FTC’s bureau of consumer protection in a statement on Monday noting that the investigation would include whether the company engaged in “unfair acts that cause substantial injury to consumers”.
See
https://www.theguardian.com/technology/2018/mar/26/facebook-data-privacy-cambridge-analytica-investigation-ftc-latest