I've seen this book a lot in bookstores last time I went to the US. This is a book that tries to convince you that "in an extrovert world, introverts also have their place and here's why/how". In practice, a lot of stroking the right way of the probable audience fo this book, not that much science, a lot of shortcuts (usually associated to "yeah of course it's a bit complicated than that, but still"). Dispensable.