Facebook authentication method
In order for your site to communicate with Facebook, you will need to create a Facebook application. You may do so at the following URL:
When asked to select a platform, click on "basic setup" link at the bottom.
Once created, click on "settings" on the left hand side, then on "add platform" button and select "website" platform.
Make a note of App ID and App Secret values. Make sure to fill in App domains and Site URL with your site's URL as seen on the screenshot below.
Make application available to general public by going to App Review tab on the left side.
Linking to your site
Once you've created your Facebook application, login to your site's control panel and navigate to "users - authentication - facebook" and fill in your App ID and App Secret values from your newly created application.