Americans don't understand what companies can do with their personal data—and that's a problem

Have you ever had the experience of browsing for an item online, only to then see ads for it everywhere? Or watching a TV program, and suddenly your phone shows you an ad related to the topic? Marketers clearly know a lot about us, but the extent of what they know, how they know it, and what they're legally allowed to know can feel awfully murky.

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