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Pretty cool project! I remember the pleasure I got out of (partially) re-implementing the Pusher API.

I wonder why real-time features aren't more popular? Real-time order status, live-updating maps, the list goes on!

I think they're not that popular because the potential revenue lift for implementing the features you listed does not seem significant.

Absolutely true! The geek in me sees a sort of halo effect of having those king of features, though, in how much I appreciate a project; I'm sure that's not as easily quantifiable.

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