There is a thread floating around about the opportunities in StumbleUpon in PPC. The OP discussed his methods some and talked about his success and since I have a mental issue, in that I like to test everything I possibly can that could generate revenue online, I gave it a run. *Disclaimer - I am certainly no PPC guru (not a guru of any kind actually) so your mileage may differ. *Disclaimer #2 - I only tested with 200.00 USD and over a couple of days. *Disclaimer #3 - I only used 2 different sites with 2 different landers and each site had only one offer each. I got traffic for sure... and it bounced like the check of a poor man trying to buy a high end piece of property on 5th avenue in New York City. Zero revenue from the traffic and if they stayed on the site longer than 5 or 6 seconds that was unusual. I did give it a try and if I thought that there was some opportunity there for my niches (Business and Finance) I would tune, tweak and adjust some and see if I could do a little better but I think that the combination of: Non StumbleUpon friendly niche Lack of PPC knowledge on my part Standard StumbleUpon travelers gave me poor results. It may be a good method just not for me. I'm not calling out the person that made that post, I'm just sharing my results. I probably won't be going back to fine tune and test more as I know I can spend that money on Adwords and do much better as I do have some successful Adwords campaigns running.