I loved StumbleUpon, and I find myself missing a discovery tool like that one. Reddit and other websites give me the impression of running in loop. If anyone has good discovery tools to recommend!
I second this! Algorithmic discovery tools solve for sameness whereas StumbleUpon solved for variety. It was a wonderful tool for breaking out of thought bubbles.
As a college student outside of the US who had never heard of YCombinator, StumbleUpon was how I discovered HN. Now I work at startups and can't imagine going back to a bigger company. Strange to think that in a world where StumbleUpon didn't exist, I may still be working at BigCorp.