What is Snark? According to New Yorker film critic David Denby, it weakens our public discourse, our intellectual pursuits and even the traditions of American humor. He joined Think host Krys Boyd on Monday to discuss the rise of the phenomenon and his new book of the same name, Snark (Simon & Schuster, 2009). Think airs Monday-Thursday from noon-2 p.m. on KERA (90.1 F.M.).