Half of YouTube’s views are already on mobile devices, with mobile watch time growing nearly 100% in the past year, compared to growth in overall YouTube watch time of 50% in that period. “For us, most of our focus is on mobile: product development for mobile, content development for mobile, making sure mobile video works on carrier networks all around the world. It’s all mobile, mobile, mobile,” says Robert Kyncl, YouTube’s Head of content and business operations.