Are you on LinkedIn.com? Do you have a blog to share, or a story to tell about you success as an author? If so, LinkedIn is the network for you. LinkedIn is a professional business network for learning from other authors, sharing your accomplishments and learning about their accomplishments.
As a member, you are introduced to book reviewers, editors and agents, and if you have publish a book or several books, you have a chance to brag about your book or books. You can include your book cover.
As a member you can join groups, invite others to join your network and become connected with other groups. When someone introduces you, you get to connect with people around the world. And, it's more effective when someone introduces you than you introducing yourself.
You can participate and communicate with authors in your writing genre and other genre's.
Check out http://powerformula.com and http://bitesizemarketer.com.
Learn to network and connect with potential customers for your books and your expertise.