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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.
Twitter for "Mountain Lion" takes a leaf out of iOS 5's book. You can also update your contacts with your Twitter contacts so you can contact them from your iPhone or iPad.