https://www.recode.net/2018/3/17/17134072/facebook-cambridge-analytica-trump-explained-user-data

Cambridge Analytica, the data analytics firm that helped Donald Trump get elected president, amassed a trove of Facebook user data for some 50 million people without ever getting their permission, according to a report from The New York Times.

Facebook is in another awkward situation. The company claims that it wasn’t breached, and that while it has suspended Cambridge Analytica from its service, the social giant is not at fault. Facebook contends that its technology worked exactly how Facebook built it to work, but that bad actors, like Cambridge Analytica, violated the company’s terms of service.