Facebook extended its single sign-on and deep-linking options to native iOS applications for the iPhone and iPad, enabling them to be more easily discovered by mobile users of the social network.
Developers who enable SSO for their apps can ensure that the apps are included in Facebook’s mobile news feed, timeline, requests, bookmarks, and search.
And deep linking allows developers to direct users to specific pages within their apps, instead of a landing page.
Facebook offered more details in a post on its developer blog:
When we introduced social app discovery on mobile in October 2011, we enabled distribution directly to native iOS apps. Today, we are introducing granular controls for native iOS apps to provide an optimal user experience when driving traffic to your app from Facebook for iOS.
By default, published news feed or open graph stories will link back to the provided story URL. For example, you may link these stories to your mobile website, or you may link to an intermediate page that then redirects to a mobile website, desktop page, or native URL.
When a link is tapped in the Facebook for iOS app with deep linking enabled, the user is immediately directed to your iOS app. If the app is not installed, the user is taken to the App Store to download your app. To ensure an engaging user experience, you should process the incoming link when your app is activated. For example, a news app will have the incoming link correspond to a news story. You would want to direct the user straight to that story instead of a generic app landing page.
More information for developers is available here.