If you already own a popular Facebook page, or are fervently creating them hoping that you might get some viral action, then you should look into this.
Facebook is powerful because anything you do on there has the potential to go viral. However, even if you don't go viral you can still make money (albeit on a smaller scale.)
Here is a full-fledged article posted as a Facebook discussion thread:
Code:facebook.com/topic.php?uid=123027377798847&topic=1