• by Laurie Sullivan , Staff Writer @lauriesullivan, July 28, 2009

1) Better data and sophisticated insight provides results 2) No compelling reason to use dozens of ad networks 3) Measuring the impact of ad network buys on branding is still very difficult, if not impossible 4) Scale matters 5) Ad networks rise and fall with key hires and defections

... according to Jordan Rohan, founder and managing partner of Clearmeadow Partners.