https://www.newscientist.com/article/2164029-cambridge-analytica-trump-and-facebook-heres-what-we-know/

Data analytics firm Cambridge Analytica, which says it can “change audience behaviour,” had access to information on millions of Facebook users, according to the Observer and New York Times.

Cambridge Analytica worked with the Trump campaign prior to his 2016 presidential election victory, however, the firm has said it did not use any Facebook data.