Facebook SDK 3.1 for iOS Reference

 Class References

• FBCacheDescriptor
• FBFriendPickerViewController
• FBGraphObject
• FBLoginView
• FBNativeDialogs
• FBPlacePickerViewController
• FBProfilePictureView
• FBRequest
• FBRequestConnection
• FBSession
• FBSessionTokenCachingStrategy
• FBTestSession
• FBUserSettingsViewController
• FBViewController

 Protocol References

• FBFriendPickerDelegate
• FBGraphLocation
• FBGraphObject
• FBGraphPlace
• FBGraphUser
• FBLoginViewDelegate
• FBOpenGraphAction
• FBPlacePickerDelegate
• FBUserSettingsDelegate
• FBViewControllerDelegate

 Other References

• FBError
• FBSettings

Source:Facebook.