Well, check out the search engines for "web anonymizers" or "Tor proxy server
" is another good option.
You will probably need to use a commercial, e.g. paid for, version of the anonymizers as normal ones do not allow you to use login or post windows etc. Tor is pretty good security, it is used by journalists and even intelligence operatives.
To be honest, I looked at them once and then gave up. Nothing is really private on the internet ... you just have to accept that you are some heroic, revolutionary freedom fighters and defeat all the secrecy and paranoia the BKs seem to dwell in.
Yes, they are a little bit like a secret service spying and gossiping, turning back it on BKs and banishing folk - and you have to be aware of that - but I do not think they are really that good at it. Its is all self-defeating behavior at the end of the day and so contrary to the "love and light" stuff.