General Proxy Questions

In reference to the daily proxy lists that are being posted on this site:

How do I use a SOCKS5 proxy? Doesn't this require authentication?

What is the best way to test a proxy is still valid? Should I use Charon?

Has anyone used proxychains with a web browser?

proxy questions go here http://www.blackhatworld.com/blackhat-seo/f101-proxies/
this is the proxy list section which is why u see no questions here.
will request a mod move this correct place