This document discusses the rise of vertical video marketing. It notes that vertical video is best suited for viewing on mobile devices, as people typically hold their phones vertically. It then highlights some popular social media platforms that feature vertical video formats, like Instagram Reels, TikTok, and YouTube Shorts. The document also provides statistics on mobile internet usage and vertical video engagement. It analyzes GoPro's successful video marketing strategy, which involves creating compelling vertical video content for sharing on social media. The document concludes by recommending that brands embrace vertical video formats to better engage mobile audiences.