Form Spam

My sister has a site http://paytonwarns.com/ with a photo gallery for her daughter which was used for form spam. Surprising enough a lot of sites that were posted were ranging from inappropriate sites to company websites. I'm not sure if they were posted to help those companies which I highly doubt they need it. Some of them were posted next to a fishy site which makes me wonder if those were to get Google results to get their site more related to a site with better search results. In short i don't think any one would ever click on a spam ad in the first place, all it does is mess up search engines.

For example these sites were found
http://finance.yahoo.com/
http://geocities.yahoo.com/
http://facebook.com/
http://adwords.google.com/
http://equifax.com/
http://epa.gov/
http://openssl.org/
http://fas.og/
http://nortel.com/