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.
In this document we will explain the following concepts:
Canvas Page: The Page in which your app is loaded.
Social Channels: The key channels that help you grow your user base and re-engage existing users.
Analytics: Accessing analytics for your application.
If you wish to start building an App on Facebook now, please refer to our getting started tutorial. If you want to build an app to add to the tab of a Facebook Page then you should refer to Page Tabs.