| http://www.w3.org/ns/prov#value | - This can be done in several ways: by going to platforms such as Yahoo or Google and searching for the ad preference page, by mousing over to individual sites hosted by advertising industry groups or by clicking on tiny new icons advertisers are placing in ads, labeled ???Ad Choices.??? Critics say the various options are too cumbersome and don???t protect sensitive data, such as health interests.
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