Why pop culture’s zombie fixation is really the Internet’s fault.
By David Weinberger.post 
Our collective fears mirror our media. Back when the media were mass, so was our world’s threatened end: Hydrogen bombs would rain upon us and we’d all go together when we go, as Tom Lehrer used to sing. You can’t get much more “top down” than a nuclear holocaust delivered by intercontinental missiles.
But now we have the Internet, so our nightmares are bottom up and peer-to-peer: the zombie apocalypse, the killer virus apocalypse, or the two of them together. But even if we never meet an army of lumbering undead in real life, society’s fascination with a viral apocalypse can teach us a lot about how we use – and abuse – the Internet.
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We like the evolutionary model for federated wiki. But why would natural selection produce a species with the power to annihilate all life? There is no why.