I suggest you add/invite random people whom you think may be of help to what you are adhering to. This way, whenever you post, comment or update you FB fanpage, they will see it on their news feeds and may become interested in it. Since Facebook can be connected with Twitter, your friends in Facebook who also have Twitter may follow you..
But keep in mind, Facebook accounts are handled by people with various interests and preferences, so results are sure to vary even if you follow my advice.. Also, when posting in your wall, always make sure that some, and not all your posts should be of relevance to your FB Fanpage, as the people may think you are advertising or something, and being an account holder in FB, this is irritating for me. And on occasion, try tagging friends in one of your Notes pertaining to your fanpage.. But do not do this as often, but only on rare cases.