Borrowing some ideas from the PHP SDK to connect to the Facebook API via node.js
The access_token utilized to make calls is currently retrieved from the request cookie headers. Therefore all calls must pass along a request with a 'cookies' property containing the parsed cookie header (i.e. req.cookies). A more flexible approach will come soon or feel free to fork.
Still a lot to add on and move around but it's a start.
Also see: