Above is our latest interactive case study from Ogilvy Cape Town for the launch of the new Audi A3. In the first half of 2013, we got an 18-wheeler truck to drive across South Africa, guided by tweets from local people. Inside the truck was a brand new Audi A3 Sportback. The Idea was called the Audi A3 Exchange, giving people an opportunity to exchange their own car, for the new Audi A3 that was inside the truck.