Understanding how the industry of web libel works is important to solving whatever problem you’re having with web libel. This article gives some assigned reading to help you to understand exactly how the industry works and how web libel companies do what they do. Although I can’t speak to the caliber of the books, it is definitely important to educate yourself on the topic.
http://www.websitemagazine.com/content/blogs/posts/archive/2009/09/14/reading-up-on-online-reputations.aspx