I have considered a similar site, and have on my "list" getting three or four serious, dependable teens to write short blog entries on topics of current interest, with commenting enabled. I would want a more robust comment feature than the one that comes with MODx for the bundled blogging system, though, since they would really need to be closely moderated. We are dealing with teens here, and anyone who remembers their teenage years or has teenage children knows that they can get carried away sometimes.