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The author mentions Facebook, but from my observations, it seems as if Facebook is much more real-time.

Does anyone know how Facebook is doing their live-updating? Are they using polling a la Ember.js, or are they doing something along the lines of Web Sockets/long polling?

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I think they're using polling for everything but the chat. I base this solely on how Facebook behaves, theres usually some delay in the updates and such and I believe a lot of things require mouse movement.

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