Er wait, that was an old policy. Here's the new one: "You may cache data you receive through use of the Facebook API in order to improve your application’s use

Er wait, that was an old policy. Here's the new one: "You may cache data you receive through use of the Facebook API in order to improve your application’s user experience, but you should try to keep the data up to date. This permission does not give you any rights to such data."