If you are a self published author or looking for ways to promote and marketing your book. You are probably looking for sites where you can share your book, book review, and book trailer at. There are some great author related sites out there that offer free membership for authors to showcase their books. Of course they are flooded with authors all trying to do the same thing, however, many authors seek this method of self promotion.
Check out the Network of CBM. They can place you on up to 100 separate sites.