NEW YORK--(BUSINESS WIRE)--The Interactive Advertising Bureau (IAB) today released the “State of Viewability Transaction 2015,” a position paper offering the digital media and advertising industries guidance on how to manage the shift of digital media’s “audience currency” to 100 percent viewability. The IAB statement heralds the collaboration among the digital trade association, the ANA, and the 4As that has stewarded the historic change in advertising measurement, but labels 2015 a “year of t