StumbleUpon Logo — StumbleUpon is a commercial website that integrates a social network that allows users to exchange online pages of interest mainly using atoolbar available as an extension to the browser Firefox , Mozilla Application Suite , Internet Explorer and Google Chrome . The system automates the collection, distribution and review of web content in an intuitive way, providing the user to browse the network and locate pages of interest with a single click, after completing an initial registration where the user identifies their areas of interest and other preferences.
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On May 30, 2007 StumbleUpon was acquired by the company eBay for the amount of 75 million U.S. dollars. More