Advertising on StumbleUpon
I was a paying customer/advertiser on StumbleUpon. It was a great tool to promote articles from my design website. Suddenly, they stopped approving my campaigns, claiming there were to many ads (there was a medium rectangle on the right and a leaderboard) and the content was duplicated from the web, which was not true. All the text content was original (not copied from anyone) and all images were authorised by the designers or artists for publication.



