How to create and configure Facebook API keys?
1. Login to Facebook
Before creating a developer account, login in to your Facebook account.
2. Developer Account
You’ll need Facebook developer account to get started. If you don’t have one, upgrade your personal Facebook account to a Facebook Developer account now. Skip this step, if you already have a developer account.
3. Create new Facebook app
Choose Apps in the header navigation and select Add a New App.
4. Choose Platform
Choose the platform you want to add. If your app is on multiple platforms, you’ll be able to add them to your Facebook app later.
5. Choose a Name
Choose a name for your app and select Create New Facebook App ID. Choose a category for your app. If you’re creating a test version of an existing Facebook app, select the app you’re testing.
6. Follow “Quick Start” Steps
The quick start wizard will help you to set up your Facebook app for the selected platform. You can come back to the quick start wizard at a later time to either continue your setup or add a new platform to your app.
7. App ID
8. Protect your App Secret
Facebook auto-generates an app secret associated with your application. The application secret authenticates requests made by your application to Facebook servers and should be treated like a password.
Do not output your Facebook application secret in your webpage markup; be careful when committing files containing this value into source control software such as a public Git or Subversion repository.
9. Contact Email
You need to add a contact email for each app. Go to your app’s dashboard and select the navigation item Settings in the left sidebar and provide a valid contact email.
10.Enable Development Mode
New Facebook apps exist in development mode by default. This limits published actions and related objects such as friend tagging to Facebook Timelines owned by a developer of the application.
Once your application is ready for public use you can switch from development mode to public mode to allow your app to interact with Facebook accounts not associated with your app.
After creating App, Add API keys in API settings and all done!
Jobs / Settings / API settings / Facebook