Nowadays, the anonymization and greater social distance involved in online social interactions appear to facilitate misbehavior and a lack of empathy. Why is it easier to ignore, criticize, or mock people when online?
In the 80s we kept them bushy, in the 90s ultra-thin, and nowadays bold and big. Eyebrows have undergone many changes through the years (some arguably better than others). One change has been key to human socialization.