Is The Internet An Echo Chamber?

Contra Eli Pariser, Jesse Walker doesn't think the internet isolates its users, especially in the realm of politics:

Last year Matthew Gentzkow and Jesse Shapiro, two economists at the University of Chicago, did a formal study of the levels of ideological segregation online. Their paper, to be published in an upcoming Quarterly Journal of Economics, noted that the Net “makes it easy to consume news from multiple sources.” … Not surprisingly, the scholars found “no evidence that the Internet is becoming more segregated over time.”