All I can see under privacy settings are broad controls to let friends or friends or friends see your account details.
What I want to do for example is make my interests public but keep my favourite music private - something like that.
Web Applications Stack Exchange is a question and answer site for power users of web applications. It only takes a minute to sign up.
Sign up to join this communityGo to your favorites
http://www.facebook.com/USERNAME/favorites
Select edit in the upper right and you should be presented with a layout similar to the following.
Set the music section to Only Me