Assuming people go to your fan page versus reading your posts in their news stream.
Stop for a minute and think about the fan pages you have "liked". I am willing to bet that the majority of them you visited one time - the time that you "liked" it - and then never again. This is true of most people. Generally people read their news feed and that is all. Look at this nifty graphic to see how what I'm talking about:
- You need to post to your fan page often so people don't forget you. I like watching Project Runway and I "liked" the fan page which I've been to once, so now I get constant reminders about the show. Even when the show isn't currently airing I get posts about Project Runway. This is good marketing.
- You can't expect that all your fans read your post. If you have something important, post it several times. Get creative with how you post it so you don't sound redundant, but you must say it more than once.
- Fans who go to your fan page often are probably stalking you. I'm just kidding. But sort of not since very few people repeat visit a fan page without good reason.
A more interactive way to use Facebook is to set up a Group. All members of groups get notification whenever someone posts and, if you're in a good group, members are much more likely to interact.
Do you have a fan page? Does this information change the way you plan on using your fan page?