I have just finished the book from Bill Tancer (Head of Research a Hitwise). I heard about “Click:What Millions of People Are Doing Online and Why It Matters” before it was released, it was in July, when we had a presentation from Hitwise. The guy mentioned Bill Tancer and told us he wrote a book: I then checked on Amazon and indeed the book was there but not available before September 
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I remembered last week only about this book, and finally bought it.
Let’s give you the context first: Bill Tancer is head of research at Hitwise, and have access to data from several ISP, cross countries, cross languages, and therefore have the possibility to know what the people research on Google, and also what kind of websites we visits, profile of visitors, CSP, gender and any other criterias requested for deep analysis. Imagine how much you know about people on the web!
Bill Tancer picked different topic/industry and reported it with a very very deep analysis. When do you think the big peak for the keyword “prom dress” happens? What’s the correlation between social network like Facebook and porn websites? What are our FEARS? It is an amazing book, which I recommand to anyone into online marketing in general.
Bill Tancer has pushed the analysis so far that we feel reading a book on psychology sometimes. He describes certains behavior we have on Internet and give interpretation, and explanation to these behaviors, and you’d be surprised to see why!
A Must-Have book in your library, highly recommanded.