This article about teenagers using Google Docs is just fascinating. It’s a testament of the futility of trying to stop elemental forces like “teenagers wanting to pass notes to each other.” Or, frankly, anything that somebody really wants to do, and someone else for some other reason (preserving authority, preventing copying of media, etc.) doesn’t want them to do. Give the kids a tool and they will find the mostly-disused feature they can repurpose. Fight it all you want, but users will do what users want to do, and the it’s smarter to figure out how to make that work well for everybody than try to force a less satisfactory behavior that they don’t want.