Cambridge Analytica
Cambridge Analytica is a data analytics firm specialising in behaviour-driven work on elections. It was backed by hedge fund billionaire Trump donor Robert Mercer and was previously run by former Trump chief strategist Steve Bannon before he began working at the White House
In March 2018, the firm was accused of exploiting Facebook data to harvest "millions" of profiles of U.S. voters without their authorisation, according to a former employee who blew the whistle. Facebook announced it was suspending the com for violating the social media company's standards and practices - two years after allegations of this practice had first emerged. The company has denied any wrongdoing.