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But fundamentally, this micro-announcement service does serve two needs: to post updates with low overhead and to follow a concise stream of updates.

If you care about productivity, don't check your Twitter feed while you're trying to get work done. Disruptions are deadly for productivity because it takes several minutes to reorient the brain every time you go off track looking at something else. Stick to checking updates once per day—for example, during lunch. All the tweets will still be there.