Web tracking, which allows companies to deliver targeted ads as you surf the Internet, keeps track of your browser, not you, writes Dan Tynan. "[W]hile it's possible a Web tracker will know everything your browser did -- or pretty close to it -- it won't necessarily know whose fingers were on the keyboard at any time," he writes. Also, while you may believe that only a few companies use Web tracking, the practice is actually widespread, he writes.

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