StumbleUpon wants to replace web and video search with browsing by integrating some of the best features of social networking. It’s an amalgamation of ideas that takes inspiration from Digg, TiVo, MySpace and just about every other social networking service you can imagine, but it can sure do a lot to increase your traffic.
StumbleUpon is a plug-in that automatically loads websites recommended by its users – based on categories that you select. The company uses tagging to define content, and lets users give a thumbs up or down to rate websites.