EDIT – This post is old now, so I’ve written a new one with updated instructions and screenshots. You can see it here.
If you’ve got a Facebook fan page for your game (you might have created one from the previous tutorial), you might want to set it to automatically post an update to your page when someone posts in your game on OngoingWorlds.
This can be done by adding an app to your page called RSS Graffiti. To get started, go to the app page here: http://apps.facebook.com/rssgraffiti/