The four star rating is a compromise between a 5 for theoretical strength and a 2 for ill-fitting methodology. There are some gems of insight and analysis in this book, and it's going to be an invaluable resource for my own research. On the other hand, it's got some serious flaws.
The author buries the lead *deeply,* the author doesn't really state her thesis until the last few pages, the bulk of the work seeming disjointed and meandering in the absence of a clear roadmap up front. Also, her research is a poor fit for her analysis: the book would be stronger without her sociological data set, as purely a theoretical contribution to the literature on democracy and online community. Her definition of "community" unhelpfully conflates infrastructure, branded content and groups of people communicating or working around a common interest.