This is A+ non-fiction. This book is a history of the idea that you can sell attention for money, using content as merely the attractor of the attention. Wu traces the whole history of this concept from early newspaper sales tactics, through war propaganda techniques, on through Google, Facebook, and so forth.
One thing I really appreciate is that Wu isn’t explicitly arguing that the paradigm of attention sales is a bad one – he’s asking us to deal with what it means. I wish everyone in tech would take a peek at this book.