Let's not forget also that you can only search for what you know to exist, and so a perfect search mechanism will still be limited by the means of discovery we have at our disposal. Yes, we could depend on existing media and word of mouth channels to discover what we wish to search for, but we can probably do better. I think discovery inherently depends on some centralization. E.g., we watch the evening news because it centralizes a bunch of information that we would not generally know to search for.
Proximity is still an important logical concept even if networks makes it physically unnecessary.
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