Do you got a problem in accessing a website from your school/college/company. One of the solution for this problem is Using Proxy.
Proxy server acts as a surrogate of your system. You can set a proxy from your browser advanced network properties. Firewall filters and blocks a website by its content this is bypassed by proxy where data from website is fetched by proxy and transfered to you. There are many proxies available the best proxy would be the one that is continously available for us. are websites providing proxy list to users of world. If you cant understand about configuring proxies and getting proxy addresses then I suggest you to use software for this purpose , the best proxy software as of now is Ultra Surf but as it is known to everyone even this software may be blocked.
You can get a list of proxies from http://www.samair.ru/proxy/time-01.htm
Hope this article addressed your purpose , feel free to ask your doubts.