I really like Jon Ronson's work - books, tv and radio - and this was a decent enough read, but it just felt so slight. 
 There was a long-ish article in the Observer recently, written (I think) by Jon Ronson himself in the run up to the release of the book, which featured a couple of the the case studies within, and I have to say, if you saw that article, you're not going to get much more out of the book.