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On the call with reporters, Mr. Vladeck said he had little patience with Google’s explanation, and referred to other privacy violations about which Google has also said it was unaware, like collecting personal data with its Street View cars. “As a regulator, it is hard to know which answer is worse — I didn’t know or I did it deliberately,”

Google and other advertising companies use cookies, which are small files that contain information about Web users, to show personalized ads as Internet users travel around the Web. If an Internet user visits fashion Web sites, for instance, Google might show the person ads for clothing companies on other Web sites that person visits.