Centralized scaling

• "Large" web sites now handle ~70M users without trouble. These are 3rd party usage numbers so should be only mildly inflated.
• Hard limits on the numbers of humans that can use a given system. 6 billion max, linear but slowing growth.
• With factors of economics (who can pay), language (who can read it), site preference (who wants to use it), and usage. This gives us numbers not much larger then the existing sites handle.
• Meanwhile the computation power, bandwidth, and storage of the servers is still following Moore's law.

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