In a recent study, Pew Research partnered with Facebook and discovered a major phenomenon: the typical user receives more comments, messages, and "likes" than they give out. Why is this? Turns out, everyone has a few zealous Facebook friends who are extra engaged in one or more activities on the social network. These friends are called "power users" and are essentially invisible drivers of most of the site's activity. What do they do, and why should businesses take notice?