The proxy site is the solution. Ask any high school kid what the latest free ones are, as schools do the same thing. They block the proxy sites as they find them, but there are a lot of them. There was a story in the news about a school kid trying to do a report on our city of Toppenish, but everything was blocked. It has Top[penis]h in it, so it was blocked...
You'll need to go into your browser control panel to setup a proxy instead of going to the internet directly. The connection to the proxy should be in a secure tunnel so they won't know where the proxy is taking you.
My workplace blocks places too, but they also run a proxy server. You can't get out at all unless you use their proxy server, and their proxy blocks a lot of stuff. I'm not sure if you can run a proxy on top of a proxy (your browser only allows one proxy address or a direct connection). Someone probably makes software to do that.