MOBILE PAYMENTS: A Chicago Cabbie Collects Credit-Card Fares with Square Square, a mobile payments firm, became one of last year's major epayments success stories. I read a lot about the firm, founded by Twitter co-founder Jack Doesey, over the past year, but I had never seen one of the devices in action until a week ago. I gave my credit card to a Chicago cab driver, as I … [Read more...] about First Square