StumbleUpon co-founder and CEO, Garrett Camp, has stepped down from his position and will become chairman of the company. Camp, who after 10 years of leading StumbleUpon, wants change. He explained that it's "time for a change" in a post on StumbleUpon's blog:

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.

StumbleUpon is now seeking a new CEO, immediately. The rest of its executive staff will continue as is. The next thing to see is who StumbleUpon, well, stumble upon for their next CEO, as well as what Camp has up his sleeve as to his next move.