title: Node.js Passport deserializing Users returns 20+ identical users
body: <p>Everything seems to works. The request to <a href="http://www.parse.com" rel="nofollow">Parse.com</a> checks if the users exists and either creates it or retrieves it.
  I'm having two main problem. First, when the <code>deserializeUser</code> function is called it returns 20 identical users and the <code>findUser</code> function, as it should, returns those 20 users.
  Also, I can't access the <code>req.user</code> </p>
  
  <pre><code>    passport.serializeUser(function(user, done) {
  
              done(null, user.objectId);
      });
  
      passport.deserializeUser(function(uid, done) {
  
              console.log(uid)
              // This outputs the ObjectId 20 TIMES!! ??
  
              Parse.findUser(uid,function(error,user){
  
                  done(null, user);
              })
      });
  
      // CONFIGURATION
      app.configure(function() {
              app.use(express.bodyParser()); //read
              app.use(express.cookieParser()); //read
          app.use(express.session({ secret: process.env.SESSION_SECRET || 'abcde' }));
          app.use(passport.initialize());
          app.use(passport.session());
              app.use(app.router);
              app.use(express.static(__dirname + '/static'))
      });
  
      passport.use(new FacebookStrategy({
              clientID: process.env.FACEBOOK_APP_ID || 'app_id',
              clientSecret: process.env.FACEBOOK_SECRET || 'fb_secret',
          callbackURL: "http://localhost:5000/auth/facebook/callback"
          },
          function(accessToken, refreshToken, profile, done) {
  
              process.nextTick(function() {
                      _parse.user(accessToken, profile,function(parseUser){
                          //this returns the user.....
  
                      return done(null, parseUser);
                      })
              })
          })
      )
      app.get('/auth/facebook',
          passport.authenticate('facebook',{scope:'email'}),
              function(req, res){
                  // The request will be redirected to Facebook ....
      });
  
      app.get('/auth/facebook/callback',
          passport.authenticate('facebook', { failureRedirect: '/login' }),
              function(req, res) {
  
                      console.log(req.user)
                      // this works! ...
                  res.redirect('/browse');
      });
  
      app.get('/browse',function(req,res){
              console.log(req.user)
              // this is works too ...
  
              res.render('browse.jade',{title:'Browse',classes:'browse'})
      })
  
      app.get('/logout', function(req, res){
          req.logout();
          res.redirect('/login');
      });
  </code></pre>