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A message appears telling you what you can expect from Facebook integration with your "Mountain Lion" machine. Apps can also ask for permission to use Facebook integration.
Facebook can also integrate your friends' details with your Contacts, including profile pictures and birthday details. If you have this sync'd to iCloud, you will also receive the same functionality on your iPhone or iPad.
With Twitter, simply type in your user name and password and it will connect your account. It means not only can you receive tweets; you can also update your Twitter status from the Notification Center and share pictures and other things with your contacts within a range of in-built applications.