StumbleUpon Reaches 25M Registered Users, Plans For Global Expansion And API

CEO Garrett Camp tells me that content discovery service StumbleUpon hit 25 million registered users earlier this week, and that those users are pretty damn active ? the service is now seeing 1.2 billion Stumbles a month. For someone like me, who sees the impressive traffic that StumbleUpon can drive to an article, the growth isn't a big surprise, but it's worth remembering that StumbleUpon had some, uh, stumbles of its own, having been acquired by eBay and then spun out again as a separate company in April 2009. At the time, Camp says the site had about 5.5 million registered users, so that's almost 5x growth in three years.

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