I very much belong to those negatively affected by this phenomenon. I'd wager many a HN commenter is. My RSS feeds are a carefully crafted web of information, as much of a not-echo chamber I can create. From stuff I don't agree with on almost anything - Breitbart and its national counterparts, neocon blogs, libertarian thinktanks - to sources I think of as pretty neutral - like the simple feeds of press conglomerates just feeding headlines - to the stuff I agree with vehemently and thus view as most dubious, I get it all, all day, all the time. Even syndicated across devices. I'm very rarely the one to ask "what are you talking about?" and constantly the one to explain topics. It's okay, being the AP of your social circles isn't the worst role to fill.
But it does something to you, doesn't it? I feel like my view of this world has darkened over the years. I'm only thirty years old now and I feel like we're headed for disaster on a dozen different concurrent tracks. My view of man has become shrouded in a perpetual gloom, my idea of a future a cycnical dystopia.
I know that isn't fair or true, but it's become increasingly hard to think otherwise.