Does StumbleUpon discriminate against marketing?

[TiffanyDow]

Hey Warriors:

I was testing the waters of StumbleUpon's ad campaign service, and discovered everything marketing wise, was denied. I tried my squidoo e-book, my how to write an e-book e-book, and my PLR site. All denied. I even tried linking a campaign in an article page about the site, and that didn't work either.

My squidoo lens for baby costumes was accepted, however.

Are they anti-marketing when it comes to ad campaigns?
Tiff