> It also means that they all know everyone knows it, and know that everyone knows everyone knows it, ad infinitum. Well not ad-infinitum. Just 3 levels needed

> It also means that they all know everyone knows it, and know that everyone knows everyone knows it, ad infinitum. Well not ad-infinitum. Just 3 levels needed: 1. I know (think of a graph with one node A) 2. I know that the other knows (A -> B) 3. I know that the other knows, that I know (A <-> B). That's basically how common sense works, and it helps groups of people work as a group (solve problems, achieve a common goal). But first this bootstrapping is necessary. Anyway, in this particular case it is like political or ideological common sense ("the emperor doesn't have clothes"). That's why large gathering of people were looked at with suspicion or were outright illegal, because it might start this bootstrapping process. Then before you know it, people start to act. This is probably one reason that gatherings protests are useful to -- achieve this effect. It can be done online, but a lot of communication is non-verbal, it's how people say things, how they act, dress, tone of voice, etc.