The blue social bookmark and publication sharing system.
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Specs: meta.wikimedia.org/wiki/Wikimedia_servers | 2007: highscalability.com/wikimedia-architecture | More servers 2004-2018, diagrams: commons.wikimedia.org/wiki/Category:Wikimedia_servers | noc.wikimedia.org | wikitech.wikimedia.org | https://wikitech.wikimedia.org/wiki/User:Quiddity/How_does_it_all_work