This TUTorial help you edit HOSTS file in windows (c:\windows\system32\drivers\etc). So, there's no restriction when connect to facebook, youtube, pandora ... if your Administrator prevent it. This is the best way to by-pass all restrictions.
The KEY in this method is find the ip of your restriction websites then add them to hosts file. Sometime, it's not working because they're changed IP addresses. So, you have to find IP and update to hosts file again.