Using the Web to Feed Our Irrationality?

As I am reading my latest issue of Wired, I learned the name of condition that I was already familiar with:

Homophily - the human tendency to seek out information that supports preexisting assumptions.

And, according to Wired, the internet "magnifies this echo-chamber effect."  So, whether your beliefs are right or wrong, you can find a web resource that supports your beliefs and validates whatever argument you are having.Makes sense.  This "condition" aligns with "niching" trend that is facilitated by the internet.  With a sense of individualism, people are making choices based on their own needs rather than following the masses around them.  To quote the book Microtrends,

"No matter how offbeat their choices, they can now find 100,000 people or more who share their taste for deep fried yak on a stick....the Internet has made it so easy to link people together.  In the past, it was almost impossible to market to small groups who were spread around the county. Now it’s a virtual piece of cake to find 1 million people who want to try your grapefruit diet, or who can’t get their kids to sleep at night.With the rise in freedom of choice has come a rise in individuality.  And with the rise of individuality has come a rise in the power of choice.  The more choices people have, the more they segregate themselves into smaller and smaller niches in society."

As marketers, this trend presents both a challenge and an opportunity.  The challenge is reaching broad audiences with our messages.  But the opportunity is that our dollars can be more efficiently spent targeting just those consumers likely to connect with our messages.