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The simplest way to unblock web sites at school is by using an unblocker. You can get to any blocked site this way.
Other ways to access web sites are by using sites that translate pages , for example Google Translate or Babelfish. Also try Google's cached copy of the site. However, it's not possible to login that way, so it's still best to use an unblocker if you need to login.
What do unblockers do?
Unblockers are like a gateway that pass information between the computer you're on and the site you're trying to visit. The unblocker visits the site you want on your behalf, downloads the page, and sends it on to you. So the site you're trying to visit never sees your IP. So actually you are browsing sites indirectly. Internet filters only see you accessing the unblocker, not the real site.
Here are some unblockers you can use to unblock web sites:
www.jot37.info
www.allprivacy.info
facebookunblock.biz
surf-browsing.info
proxysrock.info