The scenario is known for everyone. Being at school or at work we can face the situation: someone, like a web administrator has blocked access to the site we like the most.
For reforming the situation we used the proxy server, but today it has no use, because network administrator can block it exactly in the time it is created. Firewalls or other network blocks are not the problem anymore. Because there are other ways to get around them. Here's the free list of anonymous proxy-servers.
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