Sorin Adam Matei, PhD, Associate Dean of Research and Graduate Education, Professor of Communication, Brian Lamb School of Communication, College of Liberal Arts, Purdue University. Educated at Annenberg School (USC), Fletcher School of Law and Diplomacy (Tufts), and Bucharest University, Dr. Matei is an expert in online communities and social structures. His latest book is Social Differentiation in Social Media (https://amzn.to/30upRqM). A former journalist, his articles were published in Foreign Policy, Esquire, and Washington Post, while his work was featured in Wired Magazine and Vice. He blogs at http://matei.org/ithink.