Facebook: Single Sign-on
Visiting System Preferences > Mail, Contacts, Calendars now gives you the option to sign into Facebook right from System Preferences. Enabling Facebook will download your Facebook friends to your Contacts and keep their information up-to-date, allow you to post content to your Facebook timeline, and enable apps to work with Facebook with your permission.

Facebook: Notifications
Facebook notifications are now baked into the Notification Center. Navigate to System Preferences > Notifications, and click Facebook in the sidebar. Here, you can configure the type of Facebook notifications you wish to receive, and how many items to show in the Notification Center.

Facebook: Sharing Photos and Links
Signed into Facebook, you can now share photos and links from many Apple and third-party applications that support the integration. Safari, for example, lets you easily post links to your Facebook Timeline by clicking the Share button, and then choosing Facebook.

Facebook: Contact Information
Just like iOS 6, Mountain Lion 10.8.2 can now integrate your Facebook contacts and profile pictures into the Contacts application on your Mac. Just enable Contacts in System Preferences > Mail, Contacts, Calendars > Facebook, and your Facebook friends will begin showing up in your Contacts application. Click Get Profile Photos to spruce up your existing contacts with their Facebook profile pictures.

Twitter: New Notification Features
Notification Center can now be customized to show even more notifications from your Twitter feed. Besides just having an option for Direct Messages, you can also select to show mentions and replies from “No one,” “People you follow,” or “Anyone” by going to System Preferences > Notifications > Twitter > Notifications.

Game Center: Share Scores and Challenge Friends
In Game Center, you can now choose to share your scores on your Facebook timeline, and challenge friends to compete for certain achievements. Just navigate to a game, select an achievement, and use the Share button to post to Facebook, or use the Challenge Friends button to submit a challenge.

Game Center: Facebook Friends in GC Friend Recommendations
Game Center now uses the Facebook integration in 10.8.2 to provide more targeted Game Center friend recommendations. Now your friends on Facebook will show up in the Recommendations sidebar under the Friends tab in Game Center.

Power Nap: Now Supports MacBook Air (Late 2010)
Power Nap is Apple’s new Mountain Lion feature that lets your computer check for updates for both your computer and your iCloud data while the machine is sleeping. Up until now, only the MacBook Air Mid 2012, Mid 2011, and MacBook Pro Retina (2012) supported this feature, but now the MacBook Air Late 2010 model is also supported. Find more information about Power Nap here.

iMessages: Phone Number Receipt Now on Mac
If you use iMessages with an iPhone, then your phone number is now associated with your iMessage account, and messages sent to that number will also appear in Messages on your Mac. You can change this setting by visiting Messages > Preferences (Command-,) > Accounts > iMessage. Your phone number will appear in the email listing, and can be disabled by unchecking the checkbox beside the number.

FaceTime: Receive Calls from a Phone Number
Just like iMessages, FaceTime can also utilize the iPhone phone number linked with your Apple ID. This functionality allows you to both send and receive FaceTime calls from that phone number. You can change your Caller ID by visiting FaceTime > Preferences (Command-,).

Reminders: Shared Reminders
The Reminders app got a huge update in 10.8.2, with the ability to share your lists with others easily. Simply hover over the list name that you’d like to share and a small Share icon will appear. Click this icon to begin sharing. Type in the email address of the person you’d like to share with and click Done. Invited people will be able to add, update, and delete reminders from shared lists.

Notes: Sort by Title, Edit Date, and Creation Date
The Notes app brings along new sort features for notes stored within the app. From the View > Sort menu, you can now choose to sort by Date Edited, Date Created, and Title. This makes quickly finding a note much easier.

Dictation: New Supported Languages
Dictation now supports more languages, including Mandarin, Cantonese, Spanish, Korean, Canadian English, Canadian French, and Italian. To learn more about using Dictation in Mac OS X Mountain Lion, check out our previous article.