Facebook module make your Facebook Pages for your businesses inside your app. You can see the feed directly within the app. Before you can use this feature you have to get your Facebook API keys.
You can also find Facebook module inside of Images module, with this feature you can link your Facebook Album photo account within your app and don’t have to change application. When you add photos inside the Facebook Album then it will sync with your App so you don’t need to upload it manually within the app.