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epa06616293 Alexander Nix, CEO of the London-based political consulting firm 'Cambridge Analytica' leaves his offices through the back door in London, Britain, 20 March 2018. Britain's Information Commissioner Elizabeth Denham has applied for a warrant to search the offices of 'Cambridge Analytica', which is accused of using the personal data of 50 million Facebook members for its own campaigns during the US presidential elections in 2016 and Brexit referendum. EPA/FACUNDO ARRIZABALAGA