Interesting these are coming around now. Some services (i.e. Pubnub) have been doing this (for money) for a long time and what I noticed were at the end of the day, the use cases were actually rather limited.<p>Apart from stock quotes, bitcoin quotes and multiplayer games - polling just isn&#x27;t that bad. And it&#x27;s actually a very good place to start when developing as it&#x27;s simple.