If you have a business or a fan page on Facebook, you have the option of adding special applications called widgets to your page. These widgets can allow you to offer contests, post feeds from other sites, and much more. It is even possible to create your own widgets, which you can then add directly to your page.
Locate the App
While logged in to your Facebook page, use the search feature to locate the app you want to add to your page. Once on the app's page, activate the dropdown menu on the cover photo. Choose the "Add App to Page" option. When prompted, choose the name of your page as the place to add the app. Finally, choose the "Add Page Tab" option to install the app on your page. Once installed, it will show a widget in the form of a page tab that your visitors can click for quick access to the app.