Great little book giving an overview of a wide array of research on social networks and how information passes through them. Though near the end it gets a little too evangelical for permission marketing IMHO, I think it is a great starting point for learning about the social aspects of building web products today. Many of the cases in the book might be familiar to you if you read a lot of new business books, or books on decision-making and/or popular psychology. Adams does a good job highlighting these cases and tying them together for the web entrepreneur.
I listened to the audiobook which was a quick and easy listen. I am going to pick up a text version so I can explore the footnotes.