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"StumbleUpon, which I first mentioned in January, has officially launched.  The company has relocated from Canada to San Francisco and raised over $1 million in an angel round at the start of the year.  They've also revealed some impressive stats - the service has 875,000 registered users and a third have been active this week.  They're currently profitable through advertising, since some of the Stumbled pages are actually interstitial ads.  From the site:\nStumbleUpon is an intelligent browsing tool for sharing and discovering great websites. As you click Stumble!, you'll get high-quality pages matched to your personal preferences. These pages have been explicitly recommended (rated I like it) by friends and other SU members with similar interests. Rating these sites shares them with your friends and peers \u2013 you will automatically 'stumble upon' each others favorites sites.\nSo the question becomes: how the heck did StumbleUpon gain traction?  The only answer I can muster is that it's just so darned addictive - once you Stumble, you just can't stop.  What's more, it's incredibly accessible to the mainstream demographic - while mining the social bookmarking sites for gems takes a lot of work, Stumbling takes no effort whatsoever.  Just like skimming through YouTube videos is an oddly addictive distraction, StumbleUpon does a great job of bypassing conscious thought - it's the browsing equivalent of channel-hopping.\n\nAttention Stumblers!\nMashable's StumbleUpon account is at mashable.stumbleupon.com - if you're a StumbleUpon user, feel free to add Mashable to your friends list.\n\n\n[via SiliconBeat]"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2006/05/16/stumbleupon-has-875000-users/>