I've seen this play out time and time again. An environment like Twitter only encourages echo chambers and actively promotes the blocking of content and opinions a person might find inconvenient. If the average Twitter user wants to build themselves a little fantasy land making themselves stupider everyday that's their perogative. But if they consider themselves a journalist it becomes a real problem. Good journalism should have some basis in reality and ideally should involve going out and talking to people. It shouldn't be a work of fiction made to order for a tiny (yet significantly over represented) subset of the population.