By eHow Internet Editor
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StumbleUpon is a popular web discovery service that allows those who enjoy browsing random pages on the Internet to come together in an online social environment. While the peer-to-peer end of the website allows for inboxes, groups, message boards and sending private links from one friend to another, the web discovery allows you to choose your own interests and 'stumble' random pages categorized and submitted by people just like you.
eHow Internet Editor