Shoutbox

I would have serious concerns about providing a service like that.

While you think about it in terms of students getting around school content filters, it is not at all unlikely that it will end up used for various illegal activity, which could get the cops knocking on your door.  You might come out of it clean after explaining what it is (and handing over your logs, pointing to the next link in the chain), but that would probably not be the most pleasant of experiences.