We can learn a massive amount about people from their interactions on the internet. What kinds of products can we build now that we have this capability?
When I started thinking about these products, someone told me that he thinks personalization is bad for democracy. At first I thought that notion was absurd – after all, it is not as if the Fox News enthusiasts are out buying copies of Marx's works in order to broaden their view.
But I have thought more about this, and I have come to agree in some respects. Another friend, Drew Conway, pointed me to a book called Republic.com 2.0, by Cass Sunstein.