StumbleUpon was a web discovery platform and browser extension that served personalized, semi-random websites matching user interests via a 'Stumble!' button. Founded in 2001, it grew to drive more social referral traffic than Facebook, Reddit, and Twitter combined at its peak. The company was acquired by eBay in 2007 for over $75 million and shut down in June 2018.
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Mar 2011
Jun 2007
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