Payments for Everyone
This is pretty cool:
With Square, anyone can accept credit or debit card payments by downloading the app and plugging a little plastic cube into the headphone jack of an iPhone, iPod Touch, iPad, or Android phone.
That's not only disruptive; for people who can meet to arrange payment, it pulls action away from sites like EBay. I'm not sure how widespread this will become; you still need the card swiper gadget. Things will really change if and when you can use your phone directly, without additional gizmos...
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