We continue our discussion of data harvesting, targeted advertising and voter manipulation — practices used by firms like Cambridge Analytica. The secretive data firm collapsed in May 2018 after The Observer newspaper revealed the company had harvested some 87 million Facebook profiles without the users’ knowledge or consent to sway voters to support Trump during the 2016 campaign. A new trove of internal Cambridge Analytica documents and emails are being posted on Twitter detailing the company’s operations, including its work with President Trump’s former national security adviser John Bolton. We speak with Jehane Noujaim and Karim Amer, co-directors of the Oscar-shortlisted documentary “The Great Hack”; Brittany Kaiser, the Cambridge Analytica whistleblower featured in “The Great Hack” and author of “Targeted: The Cambridge Analytica Whistleblower’s Inside Story of How Big Data, Trump, and Facebook Broke Democracy and How It Can Happen Again”; and Emma Briant, a visiting research associate in human rights at Bard College. Her upcoming book is titled “Propaganda Machine: Inside Cambridge Analytica and the Digital Influence Industry.”

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