StumbleUpon

The serendipity button

Shut down
19902026

StumbleUpon was a discovery engine with one glorious button: press Stumble and land on a random great webpage tuned to your interests. Founded in Calgary in 2002, it served 60 billion stumbles to 40 million users, passed through eBay's hands, and shut down on 30 June 2018.

Timeline [edit]

  1. 2002
  2. February 2002 Launch
    StumbleUpon launches

    A toolbar button that serves surprising pages by interest.

  3. 2007
  4. 30 May 2007 Acquisition
    eBay pays $75 million

    One of the odder pairings of the Web 2.0 boom.

  5. 2009
  6. 13 April 2009 Acquisition
    Founders buy it back

    Camp and investors reclaim StumbleUpon from eBay.

  7. 2011
  8. 2011 Peak
    A top referrer of the social web

    For many publishers, stumbles rival Facebook as a traffic source.

  9. 2018
  10. 23 May 2018 Shutdown announced
    Shutdown announced

    Camp reports 60 billion stumbles for 40 million users; accounts migrate to Mix.

  11. 30 June 2018 Shutdown
    StumbleUpon shuts down

    The serendipity button retires after 16 years.

The site through time

Browse stumbleupon.com as it was, via the Internet Archive's Wayback Machine:

2002 2005 2008 2011 2014 2017 2018 Full archive →

Ownership [edit]

StumbleUpon Inc. 2002–2007 Founded Calgary, later San Francisco
eBay 2007–2009 Acquisition, $75M Strategy never materialised
Garrett Camp & investors 2009–2018 Spin-off, buy-back, undisclosed Independent again until the 2018 shutdown

Key figures [edit]

MetricValueAs ofConfidence
Registered accounts ▲ 40 million 23 May 2018 Reported Lifetime figure from the farewell announcement

Confirmed official figures · Reported media, cites a source · Estimated analyst or our estimate

Why it shut down [edit]

Official line: Co-founder Garrett Camp announced in May 2018 that StumbleUpon would shut on 30 June, with accounts offered a migration to his newer discovery product, Mix.

Our analysis: The stumble button was the feed before feeds: one click, one surprising page. Facebook, Reddit and algorithmic timelines industrialised the same dopamine with infinite scroll, and a browser-toolbar-era product never found its footing on mobile.

History [edit]

One button, the whole web

StumbleUpon, started in Calgary in 2002 by Garrett Camp and friends, distilled web browsing to a single act of faith: press the button, get a page you'd probably love. Thumb it up or down and the recommendations sharpened. It was the anti-search-engine: not for finding what you wanted, but for finding what you didn't know you wanted.

In the toolbar era it was a traffic firehose; for years publishers saw StumbleUpon among their biggest referrers, sometimes ahead of Facebook. eBay bought it in 2007 for $75 million, had no idea what to do with it, and sold it back to Camp and investors in 2009, a rare startup buy-back.

Out-scrolled

The mechanics that made stumbling special (deliberate, one page at a time) lost to infinite feeds that delivered serendipity passively. Mobile made toolbars extinct, and by the mid-2010s traffic had collapsed. Camp, by then better known as Uber's co-founder, folded the technology into his new app Mix, and on 30 June 2018 StumbleUpon stopped, after what he tallied as 60 billion stumbles for 40 million users across 16 years.

Similar projects

GeoCities Your neighborhood on the early web 1994–2009 Adobe Flash The plugin that animated the web 1996–2020 Delicious The web's shared memory 2003–2017 Google Reader The web, in one place 2005–2013 Google Wave Email, reinvented too hard 2009–2012 ICQ The messenger that gave you a number 1996–2024

Sources [edit]

  1. So long, StumbleUpon TechCrunch 24 May 2018 [archived]
  2. StumbleUpon will shut down as founder moves tech to a new app Digital Trends 24 May 2018 [archived]

Last verified: 11 August 2026. Spotted an error? Suggest an edit (corrections with sources are reviewed and applied).