Back in the 60's Marshall McLuhan (
http://en.wikipedia.org/wiki/Marshall_McLuhan) coined the phases "The Global Village" and "The Medium is the Message." He thought that as we had more and more information we would all find common ties and become a more unified world. We would share heroes and villains.
Unfortunately he was wrong. Our prehistory is too strong. No matter the tool we are given we tend to turn it to our primitive uses. Thus radio and TV and all the other mediums out there (Twitter, and Twatter and whatever) end up NARROWING our perspective.
Now Google is starting to tailor our search messages so that we see first that stuff we are personally most interested in.
There is a very real danger here in that each sub-group, sect, just gets reinforcing messages and actually believes that their own message is the predominant view.
The problem is that, even though I am aware of this phenomenon, I am at it's mercy. I no longer have TV and rarely listen to the radio as I walk to work. Thus my only news source is through the internet, which tends to be pretty biased because I tend to talk to like minded folks only.
Tis a dismal prospect that forebodes civil war, if we last that long.