The fact that a sneer retains elements of baring one's teeth so as to threaten predators supports 's idea that in prehistoric times, before language, our ancestors communicated threats, greetings, and submission with facial expressions.

yes. it has been proven significantly, especially with a more than ever huge influence of social media & everybody's opinion. for example, we could bring up movements such as the black live's matter movement, or something as such as the march for our lives movement. more than ever it seems as though everybody is starting to care more about this world.