7. People-Search Websites

“Ever get the feeling you’ve been cheated?”

—JOHN LYDON OF THE SEX PISTOLS

In February 2012, a man in Minneapolis stormed into a Target store with a fistful of coupons that had been sent to his house for pregnancy- and baby-related items. He was angry that Target was sending inappropriate mail to his house, where he lived with his teenage daughter.

Of course, the clerks at Target had no idea what he was talking about. But after going back home and talking to his daughter, he later apologized to the Target employees because it turned out that his daughter was, in fact, pregnant. Like most big companies, Target had created a profile of his daughter and tracked her, which is how it figured out that she was pregnant before ...

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