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Facebook integration was also planned but unfinished at launch date. OS X Mountain Lion received positive reviews, with critics praising Notification Center, Messages, and speed improvements over Mac OS X Lion, while criticizing i Cloud for unreliability and Game Center for lack of games.
Mountain Lion sold three million units in the first four days, and has sold 28 million units as of June 10, 2013, making it Apple's most popular OS X release.
Mountain Lion also added a version of i OS's Notification Center, which groups updates from different applications in one place.
Integrated links allowing the user to rapidly transfer content to Twitter were present in the operating system from launch.
The Mac App Store shows updates for Mac, not updates for i Phone, i Pad, or i Pod touch.