Cambridge Analytica whistleblower: 'We spent $1m harvesting millions of Facebook profiles'

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Christopher Wylie, who worked for data firm Cambridge Analytica, reveals how personal information was taken without authorisation in early 2014 to build a system that could profile individual US voters in order to target them with personalised political advertisements. Subscribe to The Guardian on YouTube ► http://is.gd/subscribeguardian At the time the company was owned by the hedge fund billionaire Robert Mercer, and headed at the time by Donald Trump’s key adviser, Steve Bannon. Its CEO is Alexander Nix How Cambridge Analytica turned Facebook ‘likes’ into a lucrative political tool ► https://www.theguardian.com/technology/2018/mar/17/facebook-cambridge-analytica-kogan-data-algorithm Support the Guardian ► https://support.theguardian.com/contribute Today in Focus podcast ► https://www.theguardian.com/news/series/todayinfocus Sign up for the Guardian documentaries newsletter ► https://www.theguardian.com/info/2016/sep/02/sign-up-for-the-guardian-documentaries-update The Guardian ► https://www.theguardian.com The Guardian YouTube network: Guardian News ► https://www.youtube.com/guardianwires Guardian Football ► https://www.youtube.com/user/GuardianFootball Guardian Sport ► http://www.youtube.com/c/GuardianSportVideo Guardian Live ► https://www.youtube.com/user/guardianmembership #CambridgeAnalytica #Facebook #AlexanderNix #SteveBannon #DonaldTrump #ChrisWylie #RobertMercer