I am building an app on facebook, I was going through the 'Getting Started with Open Graph' page by Facebook Developers. The author asks us to 'Add Platform' by clicking at a button with the same name at the bottom of the page, but no such button exists. What should I do?
Head to https://developers.facebook.com/apps
Then select your app or create a new app in case you haven't
Next you should get something like this (App dashboard):
Now click on settings, here's the Add Platform button:
click on the Add Platform button, then select the platform you're working on and config it
来源：https://stackoverflow.com/questions/20855711/add-website-platform-to-facebook-app