title: Push notifications service like ios facebook app
body: <p>Have you ever been using facebook app in smartphone or tablet? I'm wondering how it can send push notifications to you when you have comments, likes..etc. I'm trying to know about it and i found nodejs and socket.io. I have a question is what is the best solution to build push notifications service for ios app? nodejs+socket.io or PHP or other things....? Can you help me an idea to slove it? Thanks very much!</p>