Journalists’ Twitter use shows them talking within smaller bubbles
Having worked at a media firm, I find this very plausible.At one point I decided to take a look at my journalist coworkers' Twitter profiles.  ~95% of the people they were following were not only other journalists, but other journalists of similar, if not identical, political bent.  This makes sense, of course, because people will always prefer to hear viewpoints that reinforce their own, but for journalists this is a problem because they're supposed to be providing information, yet they are especially subject to feedback loops created when they fail in attempting to understand viewpoints that aren't intuitive to them.  Worse yet, extremism is almost always rewarded on platforms like Twitter, and because journalists are partly driven by a need for fame and brand recognition, they're encouraged to be openly biased.EDIT: I don't want to paint all journalists in a bad light.  What I described just seemed common in my experience.