StumbleUpon’s whole point was that you should not have to know what you wanted. Registered in late 2001 by four students at the University of Calgary, it grew into a browser toolbar with a single Stumble button. Pick a few categories — say, astronomy, photography, and bad puns — and each click opened a page chosen from what people like you had recommended. Camp described it in a 2007 interview as a hybrid that blended “collaborative human input with machine learning techniques, so users could discover great content they wouldn’t have thought to search for.”
Search assumed you knew the target
That was its bet against Google. Search was excellent when you knew exactly what you were looking for; StumbleUpon was for everything else. It borrowed the metaphor of channel surfing — surf directly between relevant content instead of searching, scanning, clicking, and going back. The service held nearly 500 topics, and your picks over time tuned the stream. Serendipity was a feature, not a side effect. Camp said he designed it so people could “stumble upon” sites recommended by like-minded people “[r]ather than presented with the most popular sites for a given keyword.”
Recommendations were a collective act
The engine ran on judgment. Thumbs-up on a page entered it into the database and shared it with others of similar taste; thumbs-down taught the system what to avoid. Users could also submit pages directly, add reviews, and friend the people whose taste they trusted. By 2007, Camp reported, 2 million members were stumbling about 5 million times a day and adding 16,000 new URLs daily. Every user was a curator, and the crowd’s taste — not an algorithm’s template — decided what surfaced.
The feed model replaced wandering
The slide was gradual. eBay bought the service for $75 million in 2007 and returned it to its founders in 2009. Then, chasing Pinterest and the social feed, StumbleUpon redesigned around an Activity stream, Trending pages, and a “StumbleDNA” profile that told you how much of you was tech. The wandering engine became another personalized feed, and traffic steadily declined.
The shutoff
In May 2018, Camp announced StumbleUpon would fold into Mix, a new discovery app from his studio Expa. Over the years it had delivered more than 40 million users personal content, serving up nearly 60 billion stumbles. On June 30, 2018, accounts were transitioned, and the site was gone. StumbleUpon.com still points toward Mix, which remains a web-discovery service built around finding and saving links from across the web. It is a descendant rather than a restoration of the old Stumble button and its public thumbs-up culture. What ended was the particular collective act: the human ratings that once helped steer where the rest of us wandered next.