Auto GMC Creates the World’s Biggest Tweet to Promote Its 2021 GMC Yukon 270 football fields could fit inside the design The only way to capture it was via helicopter at just above 12,000 feet GMC/Twitter By David Cohen October 27, 2020 GMC didn’t just go big to promote its next-generation 2021 GMC Yukon: It went world’s biggest. David Cohen david.cohen@adweek.com David Cohen is editor of Adweek's Social Pro Daily. Recommended articles