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Most of Africa has more robust money transferring systems than the US. You can literally text someone currency, and this has been around longer than bitcoin.

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If you're referring to M-pesa, it's an app like Venmo. The US has apps too (for example Venmo).

I think I'm referring to M-pesa, but I'm pretty sure implementations and uses existed in this system before app stores existed, ie before 2007

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