Please please please if you are going to require a Facebook or twitter or google or MySpace or whatever new service-of-the-month login, please put a video or screenshots so we can see the offering first. It's like asking for a social security number without telling what you plan to do with it.
Hey niggler, totally agree. If it was a product I'd definitely do it but is just a hack. If you're still interested in checking it out, the code (and screenshot) is here: https://github.com/malditogeek/lalo
I've been working on a similar concept but based on IRC.
Once authenticated with your Twitter account you can join a room using the URL, the path represents a channel. Being IRC based means that you can join the same channel using an IRC client.