After ten years, which seems like thirty on the Internet, StumbleUpon’s co-founder and CEO Garrett Camp is stepping down from his post and moving on to become chairman of the company.

In a post published on StumbleUpon’s blog, Champ explains that it’s “time for a change”:

After 10 years leading StumbleUpon, it’s time for a change. From Geoff and I working part-time in Canada in 2002 to over 120 talented employees today, I’ve guided StumbleUpon through an unconventional journey. We moved to San Francisco in 2006 (photo above), were acquired by eBay just a year later, spun ourselves out of eBay in 2009, and have since grown the company from 5 million to more than 25 million registered users. The last 3 years have been incredible – completely rebuilding the company and expanding from a simple Firefox add-on to one of the largest discovery platforms on the Web.

Indeed, the company has performed some amazing feats, such as coming back from the dead after being purchased by eBay.

The company will be seeking a new CEO immediately, with the rest of its executive staff staying in place.

Garrett Camp has been spending time on other startups, such as cab-crushing app Uber. It will be interesting to see who StumbleUpon goes with for the top position, as well as what Camp will be working on next.

StumbleUpon, the company that recently surpassed Facebook to become the number one website for generating social media traffic in the U.S, just broke a new record with 27.5 million stumbles yesterday, according to a recent tweet from StumbleUpon CEO and Founder Garrett Camp.

StumbleUpon is well known for driving thousands of visitors to websites that have been “Stumbled.” The sites are then marked with with a “Thumbs Up” by other StumbleUpon users (of which there are reportedly over 12 million), in effect vouching for the site as a legitimate source of information.

In April 2010, Statcounter stated that Stumbleupon was consistently in the top two Social Media sites in terms of generating traffic, bypassing Facebook back in March 2010.

Camp founded StumbleUpon in November 2001 with Geoff Smith, Justin LaFrance and Eric Boyd while Camp was a post-grad in Calgary, Canada. After moving to San Francisco, the guys raised $1.2 million a number of angel investors including Brad O’Neill, Ram Shriram, Mitch Kapor, First Round Capital and Ron Conway.

In 2007, eBay bought StumbleUpon for $75 million and owned the company until 2009 when
Garrett Camp and Geoff Smith and several investors bought it back. StumbleUpon is now an independent, investor-backed startup once again, with headquarters in San Francisco and offices in New York City.