Re/code: Verizon Ventures, the telco’s investment arm, has led a $57 million Series C round in Jana, a Boston-based startup that facilitates mobile ads in over 90 countries. Tim Armstrong, CEO of Verizon’s AOL unit, is joining Jana’s advisory board. It’s in a personal capacity, not at Verizon’s directive, per a Verizon rep. “We’re so excited about having Tim Armstrong join us. He’s the pioneer in digital advertising.”