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Gadwalladr, Carole; Graham-Harrison, Emma. “How Cambridge Analytica turned Facebook “likes” into a lucrative political tool”. The Guardian. Mar 17, 2018. Accessed before May 2020. https://www.theguardian.com/technology/2018/mar/17/facebook-cambridge-analytica-kogan-data-algorithm

https://token.kitchen/token-economy/v3ch7chapter-references