Facebook has updated the Facebook SDK 3.1 for iOS, adding the ability to integrate Facebook in iOS 6 as well as other new features. Apple has added several new native features in iOS 6 including Auth dialog and view controller (share dialog). The Facebook SDK supports the use of these APIs.
Salesforce Marketing Cloud’s chief marketing officer, Mark Lazerow, suggests that there's roughly one really important development in social marketing per year, citing Facebook's application development platform launched in 2007 as an early example. His pick for this year's model is the new Twitter ad API probably the most important development in social marketing to come along in a year.