'Norman Mailer and Marshall McLuhan expound on violence, alienation and the electronic envelope. The clash of two great minds'.
Very intriguing clip.
Couldn't find many external specifics on this debate (i.e. none).
However there's more on Mailer here and here. He wrote a couple of interesting articles for the Huffington Post, both can be read here.
As for McLuhan, there's the obvious Wiki article and the official site.