Some blogs have a "next blog" button at the top. Sometimes a random passer-by clicks on this button and ends up at my blog. My Sitemeter tells me what page they came from. Sometimes I go back and look at those pages just out of curiosity.

I've noticed that in these pages, there are quite a few blogs with a title like "John Doe's Blog" and an address like "johndoe.blogspot.com". But instead of being a proper blog, the content appears to be links to every page that appears as search engine results for a particular keyword, like the name of a city or a disease. Every page that is like this has that template with pale green dots in the background.

I wonder what they're trying to achieve?