eBay bought StumbleUpon (SU) for $75-million last May 2007.

StumbleUpon is a social media site which allows you to share your favorite web pages to other people in the SU network. You can also discover random, new sites via “Stumbling.”

StumbleUpon has now found a way back to its founders, Garrett Camp and Geoff Smith. Hopefully, these guys have something up their sleeves to improving their reacquisition. Terms of sale were undisclosed.

Camp stated:

We are grateful to eBay for its guidance. However, we realized there were few long-term synergies between the two businesses. It is best for us to part ways and focus on our respective strengths. This change makes it possible for StumbleUpon to continue to innovate and focus on becoming the Web’s largest recommendation service.

[via Techvibes, Mark Evans and PR Newswire]