The Already Big Thing on the Internet: Spying on Users

By ADAM COHEN

In 1993, the dawn of the Internet age, the liberating anonymity of the online world was captured in a well-known New Yorker cartoon. One dog, sitting at a computer, tells another: “On the Internet, nobody knows you’re a dog.” Fifteen years later, that anonymity is gone.

It’s not paranoia: they really are spying on you.

Technology companies have long used “cookies,” little bits of tracking software slipped onto your computer, and other means, to record the Web sites you visit, the ads you click on, even the words you enter in search engines — information that some hold onto forever. They’re not telling you they’re doing it, and they’re not asking permission. Internet service providers are now getting into the act. Because they control your connection, they can keep track of everything you do online, and there have been reports that I.S.P.’s may have started to sell the information they collect.