From the site:
BookBuzzr is one of the most comprehensive online book-marketing technologies out there. We’re constantly adding new features (like cover-matching games, shown) in a race with ourselves to build a technology that will help your books fly out of bookstores.
It’s useful. It engages your fans. It encourages word-of-mouth (or click-of-mouse) conversations around your book. It’s simple to use. And it’s free. Most of all, it gives your readers the authentic book-reading experience.