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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.

wikis

employees gather on them to write software, map cell-phone base stations, launch branding campaigns.Nearly every new project hatches a wiki. This is especially valuable in a global economy, where engineers in Asia can pick up a project as Europeans go to bed. The new groups that evolve on these wikis raze traditional hierarchies: An intern can amend the work of a senior engineer.