Mac OS X 10.8.2

Mac OS X 10.8.2 was an update to Mac OS X 10.8 released on September 19, 2012 with a supplementary update on October 4, 2012. It had the following features:

Facebook

 * Single sign on for Facebook
 * Adds Facebook as an option when sharing links and photos
 * See Facebook friends' contact information and profile pictures in Contacts
 * Facebook notifications now appear in Notification Center

Game Center

 * Share scores to Facebook, Twitter, Mail, or Messages
 * Facebook friends are included in Game Center friend recommendations
 * Added Facebook "Like" button for games
 * Challenge friends to beat your score or achievement

Other new features

 * Adds Power Nap support for MacBook Air (Late 2010)
 * iMessages sent to your phone number now appear in Messages on your Mac*
 * You can now add passes to Passbook (on your iPhone or iPod touch) from Safari and Mail on your Mac*
 * FaceTime can now receive calls sent to your phone number*
 * New shared Reminders lists
 * New sort options allow you to sort notes by title, the date you edited them, and when you created them
 * Dictation now supports additional languages: Mandarin, Cantonese, Spanish, Korean, Canadian English, Canadian French, and Italian
 * Dictionary app now includes a French definition dictionary
 * Sina Weibo profile photos can now be added to Contacts
 * Requires iOS 6

General fixes
The OS X Mountain Lion v10.8.2 update also includes general operating system fixes that improve the stability, compatibility and security of your Mac, including the following fixes:
 * Adds an option to discard the changes in the original document when choosing Save As
 * Unsent drafts are now opened automatically when launching Mail
 * Receive Twitter notifications for mentions and replies from anyone
 * URLs are shortened when sending tweets from Notification Center
 * Notifications are disabled when AirPlay Mirroring is being used
 * Adds SSL support for Google searches from the Smart Search Field in Safari
 * Adds a new preference to have Safari launch with previously open webpages
 * Resolves an issue that may cause the "Enable Autodiscover" checkbox to always remain checked
 * Enables access to the Mac App Store when Parental Controls are enabled
 * Support for @icloud.com email addresses
 * Resolves a video issue with some VGA projectors when connected to certain Mac notebooks
 * Addresses an issue that may prevent Active Directory accounts from being locked out
 * Resolves an issue that may cause the policy banner to re-appear prior to logging in
 * Improvements to SMB
 * Addresses an issue with NIS users when auto-login is enabled
 * Addresses an issue in which the Keychain may not be accessible
 * Ability to pre-authenticate a FileVault protected system
 * Addresses an issue that may cause Xsan to not automatically start after migrating from Mac OS X Snow Leopard
 * Security fixes

OS X v10.8.2 Supplemental Update
The OS X v10.8.2 Supplemental Update includes the following fixes:
 * Resolves an issue that may cause certain Japanese characters to appear incorrectly in Mail
 * Allows Safari to access secure sites when parental controls are enabled
 * Addresses an issue that may prevent systems with more than 64 GB of RAM from starting up
 * Resolves an issue that may cause DVD Player to unexpectedly quit

External References
Apple: About the OS X 10.8.2 Update