1.) No matter what I do, I cannot get the Facebook application to work. I tried to follow the steps shown in the XenForo manual, but the steps listed there did not match up with what the Facebook application site was showing me when I tried to create the app.
2.) Users trying to register ARE receiving confirmation e-mails, but the link given doesn't work. It directs them to a "sorry this page cannot be found" message. So I've been having to validate everyone's accounts manually.