Google is rolling out a new service that will allow users to post notes alongside web sites that can be read by other users, reports the New York Times. The service, called Sidewiki, will be a new feature of the Google Toolbar, a popular browser add-on. Sidewiki will compete against a handful of startups that perform similar functions, such as WebNotes, Kutano, and Reframe It. But Google says Sidewiki has some unique features. For instance, it uses a complex ranking algorithm to evaluate the quality of comments using "what we know about the author, and user-contributed signals such...

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