Twitter Inc. cofounder Jack Dorsey came to Cambridge on Monday to recruit a few Massachusetts Institute of Technology graduates for his mobile payments company called Square Inc. The two-year-old start-up is already one of the early leaders in the fast-growing “mobile wallet” marketplace, which includes tech giants such as Apple Inc. and Google Inc. and local companies like Scvngr and Roam Data Inc., to let consumers pay with their smartphones instead of using cash or credit cards.
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