 Wylie said Facebook knew in 2015 that it had gathered information, and asked Cambridge Analytica to delete the data, but never followed up to check if it did. Over the weekend, news broke that a data firm known Cambridge Analytica used Facebook to harvest 50 million user profiles illegitimately, which was used to target voters during Trump's 2016 campaign for the US presidency, as well as the Brexit Leave campaign. Cambridge Analytica, a data-analytics company that worked for the Trump campaign in 2016, pulled user information by paying people to take a quiz, and then proceeded to use the information it gathered from the users' friends without their permission, or permission from Facebook.
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