If you have a book available online, Yasiv.com will show you all other books in cyberspace that are connected to yours.
Books are connected to your book by various means. Some are connected by customers who viewed your book and also viewed other books. Some are connected by those who bought your book and then bought another book. Even Amazon’s suggestions to customers will connect books to yours.
Obviously, the longer your book has been around and the more popular it is, the greater amount of connections you’ll have.
Below are three screenshots of my story, The Visitor. I’ve zoomed out each screenshot so you can see how deep the connections go.