Discovery service StumbleUpon passed the 25 million user milestone last week, gaining approximately one million users per month since reaching 20 million users in October 2011.
StumbleUpon was purchased by eBay in 2007 and then became independent again two years later. It has nearly quadrupled its user base in the last three years.
“For all intents and purposes this is a new company since the spin out from eBay,” explains Marc Leibowitz, StumbleUpon VP of business development and marketing. “Virtually all of the 120 employees we have today have joined since then [when there were about 30 employees].”
Although its numbers pale in comparison to those of Facebook and Twitter, at its current growth rate StumbleUpon is poised to become a mainstream social network.
“The recommendation engine, by one StatCounter study’s measure, is already responsible for referring more traffic to websites than any other social network in the U.S. It has more than 75,000 advertisers,” reports Mashable. “And its users are active — according to Leibowitz, on average they spend about seven hours every month hitting the Stumble button.”
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