I think filters are only making formal what most people do anyway. The Internet enables people like myself (and probably many here at HN) to find other viewpoin

I think filters are only making formal what most people do anyway. The Internet enables people like myself (and probably many here at HN) to find other viewpoints with little effort. What counts is who is using viewpoint filters and how often they go outside for a look at the world. That's policy makers (who tend to stick to one of three cable networks), CEOs (CNBC is probably a main news source), and advocacy groups (think tanks and political niche sites).