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What is an unblocker?
An unblocker is like a gateway that pass information between the computer you're on and the site you're visiting. The unblocker goes to the site in your place, loads the page, and sends it off to you. So the site you're trying to visit never sees your IP. So, basically you are surfing sites in an indirect manner. School filters think you are just visiting the unblocker, not the site you actually want.Another method to unblock Facebook in school is by making your own unblocker site. This is more advanced than using someone else's unblocker but it's a lot nicer to have because if they block it, you can make another. Explaining how to do this is beyond the scope of this article, but you can find instructions here: Get on Facebook at school. You can even earn money from your unblocker if you put ads on it.
Here are some unblockers you can use to unblock Facebook:
iwati.com
externalsite.info
hamsterproxy.info
roamagain.info
weaselproxy.info