Let me clarify, you can use pusher, or something like firehose.io. Pusher uses a web socket. Pusher is cheaper when comparing against running our own dumb pub/

Let me clarify, you can use pusher, or something like firehose.io. Pusher uses a web socket. Pusher is cheaper when comparing against running our own dumb pub/sub server. Rails 4 will support SSE, however we're not riding that edge as there were existing solutions to the problem. - I think this covers most realtime problems without having to code that much, let alone a secondary server/service to handle the problem, we outsourced it, were happy.