If you haven’t used StumbleUpon before, here’s how it works. You install the toolbar, identify some categories of content you like on the web, then hit the Stumble button. The service takes you to a web page that is popular with people who share your interests. You’ve got the option to give that page a thumbs up, a thumbs down or just leave it by hitting the Stumble button again. Over time the service learns what you like and integrates that into the decisions it makes in sending you someplace new when you hit the button.
