Lately, I've noticed that the Net seems more and more homogeneous than ever. The blogosphere is full of 'what he said' posts. And the papers simply repeat each others' stories ad infinitum. Is the Net is hyperpolarizing preferences (ie you read only what fits with what you already believe - reinforcing the rigidity of your preferences), and so creating incentives for replication (people tell you what you want to hear)? Something to keep in mind.