Is your school censoring specific sites? Do you want to know how to unblock Facebook while you're at school? Then read on.
Unblockers are like a gateway that sit between the computer you're on and the site you're visiting. The unblocker visits the site you want in your place, downloads the page, and sends it off to you. So the site you want to be on only sees the unblocker's IP. So, basically you are browsing sites in an indirect manner. Internet filters only see you accessing the unblocker, not the destination site.
Another way to unblock Facebook in school is by making your own unblocker tool. This is more complicated than just using an unblocker but it pays off because you're in control. Explaining how to do this is not in this guide, but if you search for "How to make your own proxy" you should find help. You can also earn money from your unblocker if you put ads on it.
Some other ways to unblock Facebook are to use sites that translate pages, such as Google Translate or Babelfish. You can also try Google's cached version of the site. However, you probably won't be able to to log in using these methods, so it's still best to use an unblocker for Facebook, however these tricks are great for many other sites.