image from zune.net
According to zune.net:
Set up and use the Facebook app on your Zune HD
1. Download the Facebook app to your Zune HD. You can get it here.
2. On the Zune HD home screen, tap Apps, then tap Facebook.
3. In Facebook, you can do the following:
Tap Home icon to open your home page, update your status, and see the latest posts.
Tip: Tap the Zune icon to set your status to the song you are currently listening to.
Tap Profile icon to view your profile page, including your wall, info, photos, videos, and more.
Tap Friends icon to see your friends and find out what they are doing.
Tap Inbox icon to go to your inbox to read and send messages.
