When attempting to log in via Facebook or share via Facebook using Janrain, this error occurs:
error: Can't Load URL: The domain of the URL isn't included in the app's domains. To be able to load the URL, add all domains and subdomains of your app to the App Domains field in your app settings.
Please see Janrain documentation here. There is an update as of March 2018 requiring /facebook/callback be added to the Valid OAuth Redirects URI. For example, https://org-name.rpxnow.com/facebook/callback.