We will definitely be doing some facebook stuff. Once we get all of the basics done for 8.0, then we'll be looking at various facebook integrations.
It's a great news.
But I suggest you first look at the Facebook Connect protocol.
Because it will deeply affect the user login/registration process. And the User data structure may need some modification.
The best Facebook Connect integration website I've ever seen is
http://digg.com ,
If you login FB , you can automatically login to digg.com , and it can connect to facebook and find who are your friends in FB also registered in digg.com , and automatically make these friends become digg's friends. I hope it can also be available in UBBThreads.
In fact , I suggest a 'hook' mechanism , that can accept any 3rd party's identity registration/login , such as
Google Friend Connect , and
Yahoo BBAuth ...