What is this "Stumbleupon"?

I was unfortunate enough to ask this question to my brother who mentioned it.

Now I am always tempted by this little button when browsing the web.

So as a good community member I want to pass on my addiction.

www.stumbleupon.com/

The Firefox extension is here:

addons.mozilla.org/extensions/moreinfo.php?application=firefox&version=1.0&id=13...


Safe and happy hollidays,

Bruce