'Flocking' behavior lands on social networking sites - USATODAY.com

John Tropea - Delicious Social Network

In many ways, human beings behave like flocks of birds or schools of fish," says Nicholas Christakis, a physician and Harvard University sociologist who is co-author of a new book, Connected: The Surprising Power of Our Social Networks and How They Shape Our Lives , out today. "So The study of 1,178 adults ages 25 to 74 is based on data collected at the Center for the Digital Future at the University of Southern California in 2002 and 2007.