In regards to social media and fake news, I am thinking more and more about a talk that Professor Peter Kruse gave three years ago about the tendency of such systems for hysteresis effects.

If you understand German you can watch it here (6 min). https://www.youtube.com/watch?v=vSEEDB7ViyQ

("Und bist Du nicht willig, so brauch ich ....Geduld".. :-)