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== Controversies ==
Many people are concerned that companies are using too much personal information<ref>{{Cite web|title=Personalized Marketing Faces New Consumer Privacy Concerns|url=https://www.cpomagazine.com/news/personalized-marketing-faces-new-consumer-privacy-concerns/|date=2019-11-04|website=CPO Magazine|language=en-US|access-date=2020-05-08
===Use of algorithms===
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