score:3
Accepted answer
You need to bind the socket.io to the http server not the application server. Changes this to below..
var express = require('express'),
app = express(),
http = require('http'),
server = http.createServer(app),
io = require('socket.io').listen(server);
Refer Express guide for more info.
EDIT
To correct the Jquery error..
replace
jQuery(function($){
with
$(document).ready(function($)
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