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

John Tropea - Delicious Social Network

Those of us who study social networks believe they matter — that things do spread along social networks," says Claude Fischer, a sociology professor at the University of California-Berkeley. Social networking sites have brought social networks into peoples consciousness," says Barry Wellman , a sociologist at the University of Toronto in Canada who started analyzing social networks in the 1960s and has expanded his studies to online.