Google+ users can now share any book they are reading by finding it on Google Books, adding a message or note and then clicking the Google+ share box. The book cover, description and title linking back to the Google Books About the Book page will then appear in their Google+ stream. Users can also just paste the Google Books URL for a book into their Google+ share box, and that will show the cover and book details in their stream.
Let’s assume you are reading Gulliver’s Travels, and you’d like your friends to read it with you. All you need to do is simply click on the Google+ Share box, enter your message, then select which circles you’d like to share details about the book with, and click ‘share’.
When you share book info on Google+ it displays the book’s cover, the description, and title, which links back to the About the Book page on Google Books. It’s basically like sharing any other link.