ネット決済サービスSquareは既にかなりのビッグプレーヤーのようです。
英語の記事は↓
D. T. Max: After Twitter and Square, What is Jack Dorsey’s Next Move?
http://www.newyorker.com/reporting/2013/10/21/131021fa_fact_max
Jack Dorsey is a techno aesthete in the manner of Steve Jobs. Dorsey’s tastes are self-consciously in synch with the design of Twitter. “Constraint inspires creativity” is one of his credos. This obsession with streamlining helped Dorsey create Square, whose first product was a credit-card reader that attaches to mobile devices through a headphone jack. Square technology, he hopes, will one day kill the cash register, simplifying commerce the way Twitter simplifies online communication….
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