Proxy means a site which can break all the blocking walls set by your school, college, university, office or any other shared environment authority. With proxies, you can surf the www(world wide web) with privacy, anonymity and security. A Facebook Proxy removes your basic information such as IP address, country, browser type and operating system etc. You just need to open the proxy and everything else will be held by the Proxy site itself.
Whenever you go to some shared environment, you will find social networking sites like Facebook, Orkut and MySpace etc blocked. Some people think that you can't open Facebook or other sites in such places but when there is a will there is a way. If you have a desire of opening Facebook even at such places, then there is definitely a way which will take you to your destination - The Facebook.