In terms of the ways in which the machine altered our relations to one another and to ourselves, it mattered not in the least whether it turned out cornflakes or Cadillacs. . . . Fragmentation . . . is the essence of machine technology. The essence of automation technology is the opposite. It is integral and decentralist in depth, just as the machine was fragmentary, centralist, and superficial in its patterning of human relationships.
This is in part what he means by "The medium is the message." Of course, I've so far only quoted pages 7 and 8, so I'm sure I'll have more to quote and, one would hope, a better sense of what he's talking about in days to come.