This Facebook Graph SDK is used to integrate the Facebook Platform with your iOS applications. The Facebook SDK for iOS provides a way to integrate your iOS app with Facebook to read and write to the Graph API. The Graph API enables you with the ability to get data in and out of Facebook's social graph and includes: fetching profile information to provide social context, fetching user information such as their likes or photos, publish posts (including videos or photos) to Facebook and more. Facebook Developers enables you to build, grow and monetize amazing apps.
Another day, another API... Keeping on top of all the APIs that have been made public to support the plethora of web services that are available these days can be a full time job. Yahoo thought so too, and so they created the Yahoo Query Language (YQL), which provides access to hundreds of web services with a single SQL like syntax. And now YQL supports Google Buzz.