StumbleUpon was once just a browser add-on in Firefox. Then it became internet famous and was bought by eBay – only to be sold back the founders two years later. And today it is humming along with 25 million users and two bold new designs for its website and iOS – iPhone, iPad.
A bit like Pinterest…but I like it. The design is still in beta, but you can use it by visiting StumbleUpon Labs.