The article is too long and too complicated to post in its entirety here, but it's definitely an eye-opening read. Full story: The Media Bubble is Real — And Worse Than You Think - POLITICO Magazine
I think it's the result of a combination of increasing technology, and the complete abandonment of any sort of journalistic standards, integrity, and ethics by most of the MSM. Journalism is dead in America, mostly replaced with ridiculously left-slanted propaganda, one-half step removed from the old Pravda rag of the Soviet Union.