This was my beach reading over one weekend. I was able to extract a few bits of practical information. But overall, it was Google advertising disguised in the form of a marketing book. The author lost me when he used "there will be over 10 billion people on mobile devices" to substantiate one of his arguments about optimizing the mobile experience. It's the same thing as saying there are 5 billion people with mobile phones in the world right now. It's "mobile subscribers", not "people" I believe they're referring to, which is a huge difference. Interesting quick read, nonetheless.
To make the long story short, companies need to be where their customers are before purchasing decisions occur. The author refers to this as the "zero moment of truth," -- it occurs when your prospective customers / customers are researching your product online, on review sites, looking your restaurant up on Yelp, exchanging information with other users on forums, etc. You can either participate in these spaces or you can choose not to. But these days, you really can't afford not to listen to what your customers are saying about your company & your products/services.