Have you ever visited Amazon.com only to find items you’d forgotten in your shopping cart? Returned to Hulu and found you were already logged in? Have you ever noticed how the stories your favorite new site recommends change as you click on different links? Of course — those sites, like most websites, use cookies to “remember” you.
Such conveniences make life online a touch nicer and more human-feeling. They also help marketers track your online activity and enable advertisers to target you with astonishing precision.
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