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At Facebook's core is the social graph; people and the connections they have to everything they care about. Historically, Facebook has managed this graph and has expanded it over time as we launch new products (photos, places, etc.).

The Open Graph allows apps to model user activities based on actions and objects. A running app may define the ability to “run” (action) a “route” (object). A reading app may define the ability to “read” (action) a “book” (object). A recipe app may define the ability to “cook” (action) to a “recipe” (object). Actions are verbs that users perform in your app. Objects define nouns that the actions apply to. We created sets of actions and objects for common use cases and a tool for you to create your own custom actions and objects. As users engage with your app, social activities are published to Facebook which connects the user with your objects, via the action.