Investigative reporter for the Observer and the Guardian Carole Cadwalladr's year-long investigation resulted in the downfall of data company Cambridge Analytica. Her central role in the scandal is examined in the new Netflix documentary, "The Great Hack," which she discusses with John Avlon. Cadwalladr also talks about the still-open questions about Cambridge Analytica, its impact on UK and US elections, as well as citizens' lack of ownership over their own data.

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