Mark Zuckerberg cited “security purposes” Wednesday when asked by several lawmakers about Facebook’s collection of personal data on people who never signed up for the social network but whose online behavior is nevertheless tracked by the company. But he offered little elaboration.

Privacy advocates say such data collection is used to create “shadow profiles.”..

https://www.nbcbayarea.com/news/local/Fact-Check-Does-Facebook-Collect-Data-on-Non-Members-479458823.html

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