This evening I’m going to attend the StumbleUpon’s 10 Million Stumblers Party. Wow — 10 million people using StumbleUpon is a major milestone for a company that has gone through so many ups and downs. I remember the first time co-founder Garrett Camp stopped by for a cup of coffee at the Starbucks right across from Business 2.0’s office, where I was working at the time.

[related-posts align=”right” tag=”stumbleupon”] A gawky, scrawny kid from Canada, he couldn’t stop talking about contextual information, social sharing and how he wanted to use game theory to make the web more fun. This was long before the company raised money and became the hot new thing, and before it was acquired (by eBay (s ebay) for $75 million), then sold and re-funded.

I always thought StumbleUpon was a great little company that was building a structured database for the relevant web, something that Facebook is now trying to do with its Like button. In many ways, this San Francisco-based company gets overlooked for its contributions to the web ecosystem, mostly because it went to eBay and languished. Fast-forward to today, however, and Camp & Co. are still rocking out, much like their peers Kevin Rose (at Digg) and Evan Williams (at Twitter.)

To celebrate the occasion, here’s a video of Camp rocking out at FooCamp.

Garrett Rocks Out @ Foo Camp from danielraffel on Vimeo.

Photo of Garrett Camp courtesy of Joi Ito via Flickr under Creative Commons.