I have tried using Google DNS to access websites that are filtered likely by my government. I think it used to work fine with Facebook but now it didn't. Why could I pass the filter with just a minor change of DNS ? Except Google, are there still other DNS's that are free for me to use ? Also, I used to use proxies from this site http://www.proxy4free.com to access different websites but now they don't provide the ports anymore for me to insert into port area in my browser. How can I check which port a particular free proxy is used so I can get it done with my browser ? Thanks.