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

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. 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 ► http://bit.ly/2pPuLeC Subscribe to The Guardian ► http://bit.ly/2GnKRm5 Support the Guardian ► http://bit.ly/2pPMeDL Sign up for the Guardian documentaries newsletter ► http://bit.ly/2Ii9nFX The Guardian ► http://bit.ly/2pQamGp Playlists: Guardian documentaries ► http://bit.ly/GDNdocs Guardian VR ► http://bit.ly/GDNVR Guardian Features ► http://bit.ly/GDNfeatures Anywhere but Westminster ► http://bit.ly/ABWseries Anywhere but Washington ► http://bit.ly/ABWUSseries Owen Jones meets ► http://bit.ly/CorbynJones Guardian Animations & Explanations ►http://bit.ly/2Gm4dYU The Guardian YouTube network: Guardian News ► http://bit.ly/2pMSAUD Owen Jones talks ► http://bit.ly/subsowenjones Guardian Football ► http://bit.ly/2GmgtbK Guardian Science and Tech ► http://bit.ly/2pPMiDv Guardian Sport ► http://bit.ly/GDNsport Guardian Culture ► http://bit.ly/2Gm4bjK