Some schools, colleges, offices, and ISP block access to some social networking site and others despite the freedom to do anything. Sometimes, network administrators implement some script or hardware to block access to some sites, but with the help of anonymous free proxy server, these blocked sites will be accessible.

What are proxy sites?
A proxy site is a third party server for surfing and staying anonymously. It is not advisable for anyone to use proxy site to access sensitive data like emails since no one can guaranty the safety of data when accessing sites using proxy sites.
You can also check:
Top 5 Google Chrome Extensions to Change Proxy / Hide IP

List of Free Working Proxy Sites
Here are list of proxy sites that have been existing for ages and they work fine most of the time. You can try them now to get access to blocked website banned by your computer administrator or your Internet Service Provider (ISP).
http://hidemyass.com/
http://proxy.org/cgi_proxies.shtml
http://www.connectionproxy.com/
http://ninjacloak.com/
http://www.proxyboost.net/
http://www.fastusaproxy.com/
http://rxproxy.com/
http://www.zend2.com/
http://www.makemeanonym.com/
http://newipnow.com/
http://www.vobas.com/
http://www.orkuch.com/
http://www.dontfilter.us/
https://www.vtunnel.com/
http://www.proxeasy.com/
http://www.theproxyfree.com/
http://www.myipproxylist.com/
http://www.jumboproxy.net/
http://backfox.com/
http://newbackdoor.com/
http://www.freeproxy-list.com
http://www.ndblocks.com/
https://proxify.com/
http://www.hideandgosurf.com/
http://www.icedomino.com/
http://webanywhere.cs.washington.edu/wa.php
http://www.pagewash.com/
I enjoy what you guys are usually up too. This kind of clever work and coverage!
Keep up the wonderful works guys I’ve incorporated you guys to my own blogroll.
you can use this web proxy:
http://www.serversproxy.net/
is very useful
I am using Hotspot Shield Free Proxy to unblock sites and surf anonymously. Its Free. Hotspot Shield free VPN lets you access all of your favorite websites from your office and school. It encrypts network traffic, secures your web surfing sessions, stands guard against malware and protects your privacy while you surf the internet anonymously.
Check it out here: http://www.hotspotshield.com/free-proxy
@Kundan Bhardwaj, you’re welcome, glad you like it.
That is a nice list of Working Proxy Websites you have enlisted. Thanks for sharing Olusegun was looking for some.