Comments, likes, shares, @’ing someone. All of those tell the math that something is interesting or important.  So, when you see someone post something about the book, amplify it with a comment or a share (or both).  @ your friend Bill and so he is aware of the book. Grab a screen shot and send it in.  This is a mission you can do more than once.  And a mission you can encourage friends and family to do. Thank you.