A study of more than 100 popular web sites used by tens of millions of people has found that three quarters directly leak either private information or users' unique identifiers to third-party tracking sites. The study, co-authored by Craig Wills, professor of computer science at Worcester Polytechnic Institute (WPI), also demonstrated how the leakage of private information by many sites, including email addresses, physical addresses, and even the configuration of a user's web browser -- so-called browser fingerprints -- could permit tracking sites to link many disparate pieces of information, including browsing histories contained in tracking cookies and the contents of searches on health and travel sites, to create detailed profiles of individuals.
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