I've noticed that a lot of people who ARE using facebook like boxes are putting in the web address of the story as their thing to Like.
If I might make a marketing suggestion? Create a page for the story. (there is now a book category when making pages!) and have the facebook page as the like button on your website. Why? Because then, when you post as that page, it shows up on their wall. Post that you have a new post, it shows on their wall. Doing a donation drive? Shows up on their wall. If they just like the url of the story, you can't do that.