Are you proud of how your book looks? You can show it off to your friends via social networks: Twitter, Facebook, LinkedIn and Google+. Here’s how.
When your book is ready, click the 
button – you can find it on the header menu, next to the buttons “Create book”, “Add pictures”, “Customize” and “Preview”. Click on it and choose the social network where you want to share your book (Facebook or Twitter).
You can share any PastBook you have created in the past using the “Share” button.
You can also let your friends browse through your PastBook: just copy the link in the browser when you are viewing your book and share it on Facebook, Twitter, LinkedIn or Google+.
And finally, a universal option for all the socials:
– Hover the cursor over “Add pictures” button and click “Invite friends” 
. This page has Twitter, Facebook, LinkedIn and Google+ buttons 
that allow you to share your book with one click!