Crowd-sourcing. Co-creation. User-generated content. No matter which of those buzzwords you prefer, the underlying idea is essentially the same: In the world of commercial media, more and more companies are inviting users to help produce the content that they use. What is Facebook, after all, but an immense platform that allows users to operate simultaneously as generators and consumers of information? Or think of the way that most mainstream media outlets now encourage their readers and viewers to submit news tips, video clips, and the like. In short, the line between professional producers and amateur consumers has blurred considerably in recent years.