I have some experience in networks, but I do not know how your school admins set up their network. Mine uses a proxy that filters out certain URLs, such as facebook and etc.
Go on google and search for a telnet client. I understand there are ALOT of telnet servers that are basically just IRC-like chatrooms. I do not have a list, since I have moved on from this and went to "greater" things, such as pentesting. Google it, and how telnet works. It is pretty fun to use.
