Andrew Garcia Philips and Sarah Slobin (plus five data gatherers) of The Wall Street Journal report on the prevalence of trackers and cookies on the fifty most popular U.S. websites:
Marketers are spying on Internet users — observing and remembering people’s clicks, and building and selling detailed dossiers of their activities and interests. The Wall Street Journal’s What They Know series documents the new, cutting-edge uses of this Internet-tracking technology. The Journal analyzed the tracking files installed on people’s computers by the 50 most popular U.S. websites, plus WSJ.com.
Websites (top half) and tracking companies (bottom half) are placed in the circular network diagram. Roll over a website, and lines flare out to the tracking companies that collect data about you on that site. Similarly, roll over a tracking company to see what sites they sit on. Lines are color-coded to indicate first-party tracker files and third-party ones.
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