"The Internet is not free." Eli Pariser talks about the fact that Google's search results are increasingly targeted to what Google thinks you want to see. Similarly, our blogrolls all point to places we feel more comfortable.
Instead of being exposed to the views of random strangers on the street simply by virtue of the fact that we all share a common physical space, the Internet is increasingly making it possible for us simply to listen only to those people we already agree with.
That's a bubble. And that belongs in this blog.