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The hard part of a service like Facebook or Twitter is actually getting the users. Scaling is a problem that has been solved ages ago. It is something that will come naturally as you throw money/people on a service that is growing organically.

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You don't work in "cloud", do you?

Scaling is solvable, but it is not solved. If you have to throw money/people at the problem, well, that means it is a problem, right?

Getting from any place in a western country to a different place in a western country (possibly a different one) is solved. It costs money and time, an estimate for both is often available using ITA Matrix or Kayak or Orbitz or Expedia. There's effort involved, yes, but it is not generally considered a problem in the circles I frequent.

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