Facebook Inc.’s loose approach to policing how app creators and others deployed its user data persisted for years, including after a 2015 effort by the social network to restrict access, according to court documents and people familiar with Facebook. The social-media giant is now dealing with the fallout.
The Federal Trade Commission is investigating whether Facebook violated terms of a 2011 settlement when data of up to 50 million users was transferred to an analytics firm tied to President Donald Trump’s campaign, a person...