title: Mobile live synchronization (eg Trello): sockets?
body: <p>I was wondering how live synchronization mechanisms such as the one used by Trello work.</p>
  
  <p>For example when I move a card from the website, the board is immediately refreshed on the iPhone too. As Push Notifications are not reliable, I suppose a sort of open connection/socket stream is used under the hood.</p>
  
  <p>socket.io quotes Trello among its users: does anyone have any reference about Trello's mobile implementation?</p>
  
  <p>Thanks,
  DAN</p>