Spam blogs are phony weblogs designed to game Google's pagerank system. They are automatically updated by scripts.
Justin Baeder says: "Blogspot spam blogs have gotten a lot more clever in recent weeks. Today I found a one that purports to be maintained by a real person, but upon further examination appears to be run by a bot that posts links to actual news articles (complete with excerpts). The spammy links are hidden using CSS, so you can only see them when you try to leave a comment or view the source of the page." Link
