Sure, you can. If your Facebook friend wants to check the online version, she or he can check the preview of the photo book.
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!