I recently advertised my developer's guide to launching a startup on StumbleUpon. The plus side of StumbleUpon is that all clicks are 5 cents. The downside is the bounce rate is high since people are basically channel surfing. I achieved a 96.88% bounce rate in my experiment, with an average stay of 2 seconds. I wonder if it was something I said? In my test, only 25 visitors stayed longer than 5 seconds. I paid $50 for 1000 clicks, but since only 25 of them stayed long enough to read anything, I effectively paid $2 per click. Your mileage may vary, but through this and other experiments I've gathered the following tips for advertising on StumbleUpon:
In 24 hours, my listing was shown 26,050 times (to 3,187 unique visitors). The link in my ad was clicked 419 times, resulting in a unique click through rate of 13.15%. Not bad – that’s about $0.09 per click.