Alright, last night I got a plugin working that allows you to log in or register using Facebook :D
It's so awesome. While there is a bit of a delay while it sends data and refreshes the pages, it does work, though if you're using Opera it might not for some odd reason that has nothing to do with the plugin or ECC, Facebook just hates Opera.
As part of this I looked around and found an awesome PSD for the buttons, and now we're all set! Already we have a legitimate user who registered with Twitter :)