stumbleupon

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StumbleUpon is highly personalized traffic based on your interests that is served to you when you are actively looking for new sites to discover. The service requires a download of a very easily-integrated toolbar that sits right under the Address bar on your browser. To begin using the service, you click on the “Stumble!” button on your toolbar, and you can rate a site with a thumbs-up or a thumbs-down sign. As sites are continually rated with a “thumbs up,” the page is served to more and more SU users.

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