The Wall Street Journal worryingly reports that "the largest U.S. websites are installing new and intrusive consumer-tracking technologies on the computers of people visiting their sites — in some cases, more than 100 tracking tools at a time".
The top 50 sites installed a total of 3,180 tracking files on a test computer used to conduct the study!
You can find examples of what they know and other background ... and the Journal also has a useful page How to Avoid the Prying Eyes.
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