At college we could visit porn sites in computer classes and were even allowed to, as long as we did it respectfully (eg if the person next to you didn't like or if he was underage, you had to close the page). In hi school, however, if we ever got caught doing so, I think we were banned for the entire school year from computer classrooms. The only blocked things (during the 2nd year) were .zip files, which gave a 403 forbidden error, so people stop downloading NES ROMs.
Also thanks Juju for moving the Webchat. It's best it's on a stable server or hosted with Omni and the services.