That's actually not the same what you're describing.
It's no problem for somebody to store his value half in Bitcoins and half in Bytecoins as it is no problem to store value half in gold and half in silver.
Facebook, Twitter or Ebay, to the contrary, can't be used only half. Either you use it or you don't. And if you use it, there's no incentive to use another identical system simultaneously.
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