nodejs backbone and passportjs

i am using nodejs (with express) and backbone. I would like to integrate passport.js for facebook authentication.
I have the following route:

app.get('/auth/facebook', passport.authenticate('facebook', { scope: [ 'email', 'user_about_me'], failureRedirect: '/login' }), users.signin); 

What should I do in case the user logged in successfully? How can I access to the user data?
What should I do in case the user DID NOT log in successfully? How can I open the facebook dialog?

Are there any good examples of using passport.js with single page applications?

I know I am answering late but in case you haven't been able to figure out how to use facebook strategy of passport yet, you can go through example provided here.

I hope this is helpful for you :)

Here is the solution recently I have done the facebook connect with passport

I assume you install the passport modules

app.js

var passport = require('passport');
require('./lib/connect')(passport); // pass passport for configuration

routes.js

// send to facebook to do the authentication
app.get('/auth/facebook', 
    passport.authenticate('facebook', { scope : 'email' })
);

I have created a lib file

connect.js

var FacebookStrategy = require('passport-facebook').Strategy;
module.exports = function(passport) {
 passport.use(new FacebookStrategy({
    clientID        : facebookAuth.clientID,
    clientSecret    : facebookAuth.clientSecret,
    callbackURL     : facebookAuth.callbackURL,
    passReqToCallback : true // allows us to pass in the req from our route
    },
    function(req, token, refreshToken, profile, done) {
        // here you can get the user profile info
        console.log("profile : "+JSON.stringify(profile));
        // asynchronous
        process.nextTick(function() {
            //your logic
        });
    });
};