Hello, I'm new to proxies and would greatly appreciate insights for the following questions. I'm using them for Instagram + Twitter, but will soon add Pinterest to the mix. 1) How do I Verify if Proxies are Private? 2) How do I Verify if Proxies are Virgin? 3) What's the REAL difference between the normal private proxies and proxies for Instagram, Craigslist (as advertised on proxy-n-vpn and sslprivateproxy)? 4) Is there an online guide to the questions above and others (E.g. how many proxies to use per account, how type of account and use freq. influence setup, does having mult cities/subnets matter, etc.) Thanks!