One of the factors in Facebook’s ranking algorithm is how engaged your fans are with your page.
“What’s that”, you ask? “Facebook has a ranking algorithm?”
Indeed they do.
Facebook doesn’t just show all of the content from every page (or person) you friend or like. They give everything that could show up on your news feed a weight.
The more you interact with a page the greater weight it has and is more likely to show up in your news feed.
The takeaway here is that not only should you post regularly to your fan page, but you should make the effort to make posts that your fans will want to comment on.
A couple of popular ways to do this is to make posts that are funny or get some other emotional reaction. You can also ask your fans questions about what kinds of products or services they would like to see you provide.
This has the extra benefit of giving you insight onto what your customers want and the key to making more from your business.