There are many sites on the web that can help you promote your books that are on sale on Amazon or at Barnes & Noble. However, most of them charge a lot of money. Like all of us, Authors have also responsibilities and can’t afford to spend their earnings on book promotions. Unless you are a well established author, you have to find free book promotion sites that will help you promote your book. That is why many people flock to authorexpo.com. The site is owned by the same people that manage the indie spotlight twitter account. Therefore, you know that you will find good and competent service.
If you have a book that you wish to promote or if you just want to promote yourself as an author, just visit their website to add your book profile and send tweet requests.