That Postman essay was really quite thoughtful, perhaps you should submit it as its own post.

[Postman said] that the printing press has destroyed social interaction and community in the medieval sense.

More specifically, he said that the printing press destroyed the:

... coherent conception of ourselves, and our universe, and our relation to one another and our world. We no longer know, as the Middle Ages did, where we come from, and where we are going, or why. That is, we don't know what information is relevant, and what information is irrelevant to our lives. Second, we have directed all of our energies and intelligence to inventing machinery that does nothing but increase the supply of information. As a consequence, our defenses against information glut have broken down; our information immune system is inoperable. We don't know how to filter it out; we don't know how to reduce it; we don't know to use it. We suffer from a kind of cultural AIDS.

This seems like a valid point to me. People in this very thread have spoken about how great they think it is that they can look up tidbits of information with no context or meaning whenever they want. You may think that's great too. Good for you, but Postman thinks that this may have significant effects on society, and not all of those effects are necessarily good ones:

Technology giveth and technology taketh away, and not always in equal measure. A new technology sometimes creates more than it destroys. Sometimes, it destroys more than it creates. But it is never one-sided.