Melbourne Town Hall
The project started with one Melburnian, who works with population stats for the City of Melbourne. He had 24 hours to recruit the next person, who had 24 hours to recruit the next until the chain finished at 100 with a woman forced to flee Bosnia-Herzegovina. Each person in the chain had to meet demographic criteria (like age, gender, area you live, marital status, family composition, area of birth); so, each person represents 1% of the city, about 41,000 people. It was easy at the beginning of the chain, but got harder once most of the spots were filled.