I was talking with a new author who's book I have just published about marketing the book and the role social media plays. My first question with the book, the website and social media is - what are you trying to achieve and how will you you know when you have?
Writings book is a major step in anyone's life - a significant moment when you see your name on Amazon and have a book with your name on it on the shelf.
Some people write to generate business, others for vanity, and for some people it is something that they just have to do.
For this new author he is looking for the book to generate new consultancy business so is using it as a marketing/brand vehicle. If this is the driver then all your efforts should be focused on diving people to the website where you can engage then in whatever it is you do.