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Mail, Contacts & Calendars also includes new social connectors, such as Facebook, Twitter, Flickr, and Vimeo. This means you can sign in and receive notifications in the Notification Center from friends and acquaintances you are connected with.
With Facebook, simply type in your user name and password and it will connect your account. It means not only can you receive Facebook notifications; you can also update your status from the Notification Center and share pictures and other things with your friends within a range of in-built applications.
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.