StumbleUpon Alternatives, Similar

StumbleUpon discovers web sites based on your interests, learns what you like and brings you more.
Using a combination of human opinions and machine learning to immediately deliver relevant content, StumbleUpon presents only web sites that have been suggested by other like-minded Stumblers. Each time the Stumble button is clicked, the user is presented with a high quality web site based on the collective opinions of other like-minded web surfers.