It is an unconscious perception of the world that causes us to see mass slaughter of some animals but not others as normal, and tells us we should not get too worked up about it.
Social media has been a powerful tool for Marissa Alexander's defense, while providing creative ways to discuss domestic violence and self-defense.
Nikki Willoughby is social media manager at Common Cause. She oversees community action and serves as editor of the CommonBlog. Find her on Twitter @Nikki4CC or email her at email@example.com.