Behind one man’s fight to find out everything Facebook knows about him

Well before the Cambridge Analytica scandal exploded, Paul-Olivier Dehaye wanted to know what Facebook knew about him. Even more than that, he wanted to know what Facebook was doing with that information. What he learned surprised him. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

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CNBC's “Beyond the Valley” brings you all the latest from the vast, dynamic world of tech — outside the Silicon Valley.