Setup Facebook app to test authentication locally (aka, setting up App Domain)

steps.md

Note: I had issues with setting up my Facebook app so authentication would work. I'd receive the error at the bottom, and it took me a while to figure out what was wrong

Here are the steps I took:

• Go to http://developers.facebook.com/, create, and setup your app
• When inside the dashboard, click "Settings"
• Click "Add Platform"
• Choose website (for authentication via the web app)
• Add http://localhost:3000/ as "Site URL" (and "Mobile URL" if necessary)
• Add localhost to "App Domains" above
• Click Save

This fixed the error I kept receiving:

Given URL is not allowed by the Application configuration.: One or more of the given URLs is not allowed by the App's settings. It must match the Website URL or Canvas URL, or the domain must be a subdomain of one of the App's domains.

@Anindya007 yeah, I spent around 2 days to get it setup correctly, but with others I spent less than an hour.