Does your school censor some websites? Do you want to unblock Facebook at school? Then read on.
Unblockers are like a gateway that work between your computer and the site you're trying to visit. The unblocker goes to the site you want instead of you, downloads the page, and sends it on to you. So the site you want to be on only sees the unblocker's IP. So, basically you are visiting sites indirectly. School firewalls only think you are accessing the unblocker, not the site you actually want.
An alternative method of unblocking Facebook at school is to set up your own unblocker tool. This is more complicated than just using an unblocker but it pays off because you can make more of them. How to do this is beyond the scope of this article, but if you search for "How to make your own proxy" you should find instructions. You can also make money from this through advertising.
Other ways to access Facebook are to use translator sites, 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 login that way, so you're better off using unblockers for Facebook, though these tips work well for many other sites.