Which is the best digital marketing book that you will recommend?

Social media books are merely gyaan as the media is still evolving and every one has their own personal take on it. I follow Mashable to get all my latest happenings and drawing my own conclusion. If you still wants to read on digital marketing I would seriously recommend2 books (1) Net Gain (2) NEtworth by Hagel & Armstrong. They are pure genius. Also you may like to follow Avinash Kaushik and his site. he is a thought leader in digital space with very easy-to-learn digital practices.

The list is quiet long, one can find them here (http://www.goodreads.com/shelf/show/digital-marketing) !!!