And it works well!
Amazon.com sent me an email yesterday morning recommending that I buy my own book.
Amazon’s Recommendation System Works!
Jim Harper / Jim is the Director of Information Policy Studies at The Cato Institute, the Editor of Web-based privacy think-tank Privacilla.org, and the Webmaster of WashingtonWatch.com. Prior to becoming a policy analyst, Jim served as counsel to committees in both the House and Senate.
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The Technology Liberation Front is the tech policy blog dedicated to keeping politicians' hands off the 'net and everything else related to technology.