Should YouTube be part of your social marketing strategy? This infographic links top advertisers’ success to their YouTube presence and shows how the growing video-sharing platform has surpassed the cable networks in catching the 18-to-34-year-old demographic in the U.S. The ad spend for digital video is expected to reach $8.06 billion by 2016, and current engagement and revenue statistics for top brands like Nike, Red Bull, and Old Spice suggest that ROI for YouTube advertisers is on the rise.  MDG Advertising has compiled these and other statistics in the infographic below.