Square, the US payment service co-founded and run by Twitter chief executive Jack Dorsey, bought some 3,318 Bitcoins for $170 million, the company has announced. In a statement after the stock market closed, the company called it "part of an ongoing commitment to the cryptocurrency." Square had previously acquired Bitcoins for 50 million dollars, and is also looking to integrate the digital currency into its payment services, dpa reported. Square's ...