Found on Matt Fraction, Man of Action's website:
"The crowd of people was participating in the Mob Project, an e-mail-driven experiment in organizing groups of people who suddenly materialize in public places, interact with others according to a loose script and then dissipate just as suddenly as they appeared."
http://www.wired.com/news/culture/0,1284,59297,00.html
"The crowd of people was participating in the Mob Project, an e-mail-driven experiment in organizing groups of people who suddenly materialize in public places, interact with others according to a loose script and then dissipate just as suddenly as they appeared."
http://www.wired.com/news/culture/0,1284,59297,00.html