Want to give your audience a good reason to like your page? Offer them things they can only get through Facebook. For example, if you're running an e-commerce store, share discount codes through your fan page that you don't offer anywhere else—in effect, offering sales exclusively to your Facebook fans. If you're running a blog or other type of site where you're generating revenue from advertising, give Facebook fans advance notice to better content. Better yet, create content that only they have access to.