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Square promises to put an end to the headaches of traditional purchases: having to fumble with your wallet, exchange and swipe the credit card, wait for a paper receipt. But someone still needs to convince merchants.

Dorsey and Square COO Keith Rabois talk to Fast Company about their unintentional, design-driven revolution, what it means for the cash register space, the deals space, and the future of buying ... everything

Is the founding of Twitter the stuff of "The Social Network 2"? You probably know the story by now