FourDocs is where you can upload four minute docs about your world. Don’t worry if you’ve never done any filmmaking before — there’s expert help for you in the user-friendly Guides…
All the material you upload is covered under a Creative Commons licence. For your four minute films, this means any other site user is able to copy, distribute and display the film as long it is for non-commercial purposes and they don’t alter it.
More at the FourDocs page. (They also have a blog.) This looks at first sight like one of those “Let’s Try To Keep The Yoof Out Of Trouble” ideas, but who knows, it might grow out of that… (Thanks to Veer for the link.)