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The other requirement worth thinking about is the 3 seconds. How many followers are going to be watching for that 3 seconds to matter. And how much slack can be in that? Could 1.5 million followers be sleeping and not need the tweet for a few hours or only when they next sync.

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If it's a pub/sub model, you wouldn't care at all about how many were watching right? You'd just publish.

And for something like Twitter, you'd probably Publish but then also log to some kind of "Notifications" store, so if a user did care but was not actively watching, on their next subscription they'd receive the messages they'd missed.

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