The Meetup NodeJS SDK allows to access community features that aim to extend invitations in social media applications. Examples available on GitHub present events, RSVP, groups, and photos. Additional samples at https://github.com/jkutianski/meetup-api/tree/master/examples
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.
With so many projects being worked on in GitHub, often by multiple users, Kristopher Sandoval discusses why developers love the service. The benefits of collaborative editing, language agnostics and powerful versioning support make it difficult to find reasons not to use GitHub.