Dr. Michael Wesch, Assistant Professor of Cultural Anthropology at Kansas State University, a pioneer in digital ethnography and the man who brought us Web 2.0 ... The Machine is Us/ing Us and Information R/evolution presents an anthropological introduction to YouTube to the Library of Congress:

I know you've been shown this video before, but have you actually watched the whole fifty-five minutes and thirty-three seconds of it? I did last night, and all I can say is that you'll be wiser for it.