StumbleUpon is a recommended content to the user. The 25 million people who use StumbleUpon to entertainment and information source. In addition, the business sector, media and publications have used StumbleUpon to promote their brand was bought by eBay in May 2007, but in just two years later it was bought back by Garrett Camp, Geoff Smith and a group of investors. He is back in the hands of a startup again.
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