Facebook offers a cool option for authors (not to mention other people). You can set up a fan page. When people come across it and click LIKE, they will get your updates on their home page. It takes a while to build up a following for your fan page. Most of the people who have LIKEd my pages have found them by accident. I have one set up for Vampires Rule. That was my first page. Then I decided I should have used my name instead. So now I have two pages.
Every time I publish a new book, I tell people about it using these fan pages. You can add the link to your book. This usually makes a thumbnail of the book cover appear.
Here is my Fan Page for Vampires Rule: http://www.facebook.com/pages/Vampires-Rule/184193604955442
Here is my Fan Page for K.C. Blake: http://www.facebook.com/pages/K-C-Blake/246146215412824
If you've enjoyed my books and have a FB account, please LIKE the fan pages.
Thank you, and happy marketing!