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"StumbleUpon, the addictive social browsing tool, has hit one million users.  This is particularly surprising since StumbleUpon is Firefox only - it hasn't yet reached out to the mainstream.  Next week, that's all going to change - they're publicly releasing a version for Internet Explorer, which they hope will add millions more users to the service.  This could create a virtuous circle: more sites in the database means more utility for the users - that leads to more signups and longer session times.\nDespite being 4 years old, StumbleUpon was relatively unheard of until May this year, when they released a radically new version of the site and announced they had hit the 875,000 user mark.  In January, the company relocated its four employees from Calgary to San Francisco.  They also received an undisclosed amount of angel funding this year from Ram Shiram, Rajeev Motwani and Ron Conway - the sum is \"in the millions\".  \nFor those who haven't used it, StumbleUpon is a browser extension that lets you browse sites in certain categories and rate them.  The toolbar sits at the top of your browser window and you give each site a thumbs up or a thumbs down - StumbleUpon uses this data to help you discover more sites you'll like.  Think of it as Digg for browsing.  \nStumbleUpon is highly, highly addictive and I expect it to be hugely successful with mainstream users.\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\n"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2006/07/14/stumbleupon-hits-1-million-users-targets-ie/>