Last Friday, 27B asked 10 of the nation's largest ISPs to clarify their data retention and sharing policies, in the wake of a report that ISPs were selling 'anonimized' user internet history logs to data firms and an ongoing drive by the Justice Department and some in Congress to require ISPs to hold that data for long periods of time. 'Anonymized' clickstreams can easily be used to rebuild a person's online life, especially given that search engine urls usually include the contents of a search.

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