instinctively …ayers find themselves interacting with people who are more and more like them, more and more often. This has the effect of making players more and more similar to each other. We all come to instinctively know the people we like most online and who are most likely to agree with us.
I would argue this has always happened in society, however tools like Twitter remove the real life friction, making way easier to do this. This effect essentially amplifies an endogenous human behavior.