The document discusses how content can spread from person to person through social sharing online. It gives an example of a video reaching 1000 people through three stages of sharing, with each sharer sharing with 10 friends. It suggests that if more people kept sharing, the reach could grow exponentially. It poses the question of how someone might want to use reaching 1000 people, such as gathering support, sharing views, promoting oneself, or rallying people to action.