404. That’s an error.
The requested URL /users/oauth/?server=facebook&nv_redirect=_FW-jvFjKX10AWbtfAqPpMtwkw4iqDazQjMfmijcM9u00nTapcu7YzL88FITQpCrTjtqQb1beyFW48xe5GF8CURxgYEApzVPaOmDoTVpZrPrQmZD6kWOgyRwQTEBEgew
was not found on this server. That’s all we know.