Today I logged in to the Stack Exchange chat room for the first time. And, the first thing I want to know is how it works.
To my surprise, Firebug told me that the chat room page sends a request to the server at 1 second intervals. This is simple polling. I'm wondering why Stack Exchange do it in this way. There has been mature Comet technology (Long Poll and HTTP streaming) there and it is more efficient.
So, why did the Stack Exchange developers choose this most resource-costing approach?