{ JFBCLogin} ignored

There's 2 answers here:
1) If you want to skip the 'registration' page completely (like we do on this site), you should set the "Create New Users" setting to "Facebook User Only". This will automatically assign the user a username and only allow them to login with their Facebook credentials.
2) To get the user's email address to import into Joomla, you need to set the "Require Email Permission" to yes in the Permission Settings tab. Even if you have the hide email field option set, if we can't fetch an email from Facebook, we still show the field. It's a precaution to make sure we always can save the user to Joomla (which requires an email).

Hope this answers your questions, but if not, or you need more info, just let us know!

Bernardo,
Looking at your site, you're using 3.1 of JFBConnect (or earlier). We'd really recommend updating to 3.2 as it will prevent you from having to modify the code, and should fix the issue you're experiencing above.

The reason the page is going wonky is because the JFBConnect Javascript that we include is going at the very top of your page's HTML (before the head or body tags). That's causing the browser to get very confused, and obviously isn't right. If you really need to stay on JFBC 3.1, we can still help you fix up the issue, but upgrading is definitely the easier solution, and there's a lot of nifty new features in 3.2 like Open Graph support, better content plugin configuration for selecting articles, sections, and categories to display the Comment and Like box in, and and update to the comment box itself to conform to Facebook's newer requirements (as of early March).

Hope this all helps, and good luck!

No problem. Again, if you don't want to upgrade, you don't have to right now.. but it's obviously best if you do.

As for the Invite module itself, if you want, you can actually leave that as the older 3.1.x version (don't re-install the 3.2). It changed only very slightly, and does not require being upgraded. Most other modules do require updating, so don't take that suggestion too widely to other modules.

Good luck!