gistfile1.js

	passport.use(new FacebookStrategy({
	    clientID: configAuth.facebookAuth.clientID,
	    clientSecret: configAuth.facebookAuth.clientSecret,
	    callbackURL: configAuth.facebookAuth.callbackURL,
	    passReqToCallback: true
	  },
	  function(req, accessToken, refreshToken, profile, done) {
	    	process.nextTick(function(){
	    		//user is not logged in yet
				User.findOne({'facebook.id': profile.id}, function(err, user){
	    			if(err)
	    				return done(err);
	    			if(user){
	    				user.generateToken();
	    				return done(null, user);
	    			}
	    			else {
	    				var newUser = new User();
	    				newUser.facebook.id = profile.id;
	    				newUser.facebook.token = accessToken;
	    				newUser.facebook.name = profile.name.givenName + ' ' + profile.name.familyName;
	    				newUser.facebook.email = profile.emails[0].value;
	    				newUser.generateToken();

	    				newUser.save(function(err){
	    					if(err)
	    						throw err;
	    					return done(null, newUser);
	    				})
	    			}
	    		});
	    	});
	    }
	));