I found the HTTP utility setting in WP-OAuth which defaults to cURL .vs Streaming. Setting this option to Streaming allowed Facebook to login correctly with Facebook Login Widget De-activated.
If I could make a feature request –
I’d prefer the WP Username to be set to the email address returned by
Facebook (or another OAuth server) .vs generating “User#”.
I’m sure this is on your road map.
Thank you again for this effort.