This is more true than you might believe. Amazon begins to suggest a book to customers only after it reaches 20 reviews. They take it to an even higher level once you reach 50 reviews. It’s easy to do. Simply go to the books site on Amazon. Select the book you want then scroll down to the review section and select the Write a Customer Review tab. Of course I love five star reviews. You can write a full critique or say I liked the book. That’s up to you and both are helpful.