[dholowiski]

I've spent about $50 on stumble upon for my site, at $0.05 a click. As others have said it's very poor quality traffic. I don't sell anything on the site so conversions is not meaningful, but I did not get any lasting traffic from the campaign. Because my site is about beer, it was nice that I could target very specifically (males, 21-35 in california). One thing i noticed is that after you run a paid campaign, you're more likely to get organic stumble upon traffic - I've probably gotten twice the amount organically then I've paid for.