[Plugin: Social Login & Social Sharing by Janrain] How can this be compatible with other FB pugi

Same question here before I use the plugin…

Sorry for the late reply. You would need to make a Facebook app specifically for Engage authentication, separate from the one you use for FB Connect or Graph API if you are using Facebook’s API directly. The Engage dashboard checks the value of the Site URL field for the Facebook app when you save the settings, and if it isn’t the address of your RP (or your customized application domain, see below), it will return an error.

If you are a Engage Pro or Enterprise customer, we can set up a custom application domain which would redirect https://login.yoursite.com to your RP address so that the branding matches a little better in the Facebook authentication screens.