How good is it to be Stumbled Upon?

StumbleUpon is a free tool that you can use to help launch your viral campaign. Visit stumbleUpon to find out more.

I “stumbled” across this site today http://onemorelevel.com/games3/double-wires.swf

How effective is it? Well our Spam game has been linked to by over 4,000 websites. StumbleUpon was the tenth highest referrer. So not bad at all assuming this is legitimate traffic.