Building an app on Facebook gives you the opportunity to deeply integrate into the core Facebook experience. Your app can integrate with many aspects of Facebook.com, including the News Feed and Notifications. All of the core Facebook Platform technologies, such as Social Plugins, the Graph API and Platform Dialogs are available to Apps on Facebook.

The Facebook Platform provides a set of APIs and tools which enable third-party developers to integrate with the "open graph" — whether through applications on Facebook.com or external websites and devices. Launched on May 24, 2007, Facebook Platform has evolved from enabling development just on Facebook.com to one also supporting integration across the web and devices.

Facebook Platform statistics as of May 2010.

• More than one million developers and entrepreneurs from more than 180 countries
• More than 550,000 active applications currently on Facebook Platform
• Every month, more than 70% of Facebook users engage with Platform applications
• More than 250,000 websites have integrated with Facebook Platform
• More than 100 million Facebook users engage with Facebook on external websites every month

Graph API
The Graph API is the core of Facebook Platform, enabling developers to read from and write data into Facebook.The Graph API presents a simple, consistent view of the Facebook social graph, uniformly representing objects in the graph (e.g., people, photos, events, and pages) and the connections between them (e.g., friend relationships, shared content, and photo tags).

Authentication
Facebook authentication enables developers’ applications to interact with the Graph API on behalf of Facebook users, and it provides a single-sign on mechanism across web, mobile, and desktop apps.

Social plugins
Social plugins – including the Like Button, Recommendations, and Activity Feed – enable developers to provide social experiences to their users with just a few lines of HTML. All social plugins are extensions of Facebook and are specifically designed so no user data is shared with the sites on which they appear.

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