One interesting thing I done is to check how big is the questioning of Mask-efficiency between two countries. In my case, Brazil (my original country, which is in a very bad situation now) and Poland (where I live, and with a relatively good pandemic control).
So I checked for the same term (Do masks work?) in Portuguese and Polish at Google trends.
No surprise, Brazilians are much more skeptical about mask-efficiency. Maybe that contributed to the worse situation there?