Some IT security people generally hate them, but if you’re stuck behind a very restrictive firewall, anonymous proxies can be incredibly useful. A proxy is merely an intermediary, a computer that sits in the middle of your communication and forwards and receives requests. People have found that they can use them to use Facebook at work, bypass an Internet filter or even watch UK TV abroad.
Remember though to be very careful when using any free proxy that you may find online. The reason is simple, anonymous proxies cost a huge amount of money to run when open on the Internet. The bandwidth charges can be very high, so in reality there aren’t many real genuine proxies available for free. The only legitimate ones that exist are sponsored by advertising or take part in Iframes with adverts around them.
Many of the others have been accidentally left open by careless administrators or worse have been hacked and are controlled by identity thieves waiting for you to use passwords or usernames on the proxy. BY all means use proxies but be careful who runs them, the advantages may not be worth it.