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Facebook and the consulting firm Cambridge Analytica are at the centre of a storm about the use of personal data. Was information of some 50 million users gathered without their consent? Was that information used to influence the outcome of the 2016 US presidential election? Facebook and Cambridge Analytica deny any wrongdoing. Â鶹Éç's technology reporter Zoe Kleinman explains how it all unfolded. (Photo: A mousepad with the Facebook logo, Credit: Daniel Leal-Olivas/Getty Images)