Big Change in Video Ad Format with the Rise of Vertical (Portrait), GroupM’s Rob Norman Explains Why it Matters

CANNES — Social platforms have made some big announcements in recent weeks, with both Twitter’s Project Lightning and Snapchat’s 3v Advertising due to usher in auto-playing, full-screen videos. You might expect that vertically-oriented video would present a challenge to advertisers, who, traditionally, have redeployed ad creative first designed for TV’s landscape screen. But GroupM chief digital officer […]