First, you'll need to register your app on Facebook. Follow these steps:
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Visit https://developers.facebook.com/apps
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Select "Apps", then "Create a New App". (You don't need to enter a namespace.)
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Select "Settings" and enter a "Contact Email". Then select "Add Platform"
and choose "Website".
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Set Site URL to: {{siteUrl}}
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Select "Status" and make the app and all its live features available to
the general public.
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Select "Dashboard".