Go to Facebook Developers site and click on "Register now" green button to sign up as Developer to create a new app.
Choose Developer when asked what of the following best describes you?
Click on Create First App button
Enter Display Name and Contact Email, then click Create App ID
Complete Google Security Captcha
Go to Basic Settings > Fill up Basic details and make your app live
Add website as a Platform
So, now you have created your Facebook Application. It's time to integrate your website with your newly created Facebook app.
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