Remember the hearings held to crucify CL with accusations of underage girls advertising in its Adult Services section? Well, here's some reporting that dives into the methodology of the primary study presented and throws a good deal of doubt into the numbers presented. Note that this article was written by a Village Voice media reporter, and that they're very upfront in saying that since they own BackPage, they are not an uninterested third party. Nonetheless, they do a good job of objectively tearing apart the methodology of the study.
http://www.citypages.com/2011-03-23/...-junk-science/