The Canadian-born social bookmarking start-up, which launched a few years ago, came to the Bay area last year and got some fancy venture investors (Mitch Kapor, Ron Conway, Ram Shriram and others) who ponied up a couple of million dollars.

And, in your typical dot-com Cinderella story, it then proceeded to sell itself to eBay for $75 million recently, after quickly growing its user base to more than two million.

Thus: Party on, Garth!

Here’s a little video I did last night, talking to one of the impossibly young co-founders, Garrett Camp, and also StumbleUpon’s “businessman” (a code word for biz dev), David Lee.