Article: Mobile Video Challenges Hold Back Advertisers

US mobile video ad spending is rapidly expanding. eMarketer predicts that investment will grow by over 50% annually through 2016. Still, mobile video spend is starting from a small base, and it remains just a tiny slice of overall digital video and TV ad spending. Industrywide challenges with mobile video ad formats, measurement standards and inventory must be addressed before it can achieve critical mass with advertisers, a new eMarketer report finds.