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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) !!!