Cambridge Analytica had harvested the personal data of millions of peoples' Facebook profiles without their consent and used it for political advertising purposes.

The Facebook–Cambridge Analytica data scandal was a major political scandal in early 2018.

Cambridge Analytica's Alexander Nix speaking at the 2016 Concordia Summit. Photo: Bryan Bedder / Getty Images

It has been described as a watershed moment in the public understanding of personal data and precipitated a massive fall in Facebook's stock price and calls for tighter regulation of tech companies' use of personal data.

Wikipedia

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