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Share Sheets make sharing easy
Hit the Share button in many of the Mountain Lion apps, and you'll get options to share what you're seeing onscreen with other people. The sharing feature detects the file type and gives you a list of appropriate sharing options based on that.
As with the Twitter integration in iOS 5, Mountain Lion now has Twitter built in to your Mac. Sign in once to tweet from your apps, receive Twitter notifications, and view your Twitter friends' photos and usernames in Contacts.
Game Center for Mac
The popular social gaming network from iOS will now be on the Mac with Mountain Lion. See what your friends are playing, check the leaderboards, or discover new gaming friends that Game Center recommends for you. The Game Kit for developers even offers tools for creating multiplayer games that can be played on both Macs and iOS devices.