“When people try to change behavior, they often focus on … telling people what they should do,” the social psychologist Melanie Tannenbaum explained in 2013.
In other words, they support marriage equality why don’t you? They don’t dictate how you should or must behave, as laws and PSAs typically do instead, they simply tell you how your peers are behaving. Profile pictures, arguably, are a very particular and effective type of message.
