Hi BlackHatWorld, So as many of you know, sites like Facebook, Instagram, and Twitter have databases comprising of what's likely close to 99% of all proxies, without getting into too many technicalities. Most sites won't ban you if you use proxies the right way, but when they know you're using a proxy many can and will apply strict filters to your activity. Currently, there is no way to directly tell whether any of these sites really know whether you're using a proxy or not. In general, if you're using proxies it's safe to assume that the websites you visit know that you're using proxies. If you think you have proxies that are special or unique, then check them against some high-quality blacklists see if they can stand up to them. To date, the three sites that I've found to have the best proxy blacklists are leakforums.net, Omegle.com, and nike.com. If your proxies are banned on any of these sites then you can be almost certain that Facebook, Instagram, Twitter, and every other site that cares knows that you're using a proxy. This may impact your ability to use those sites effectively for marketing purposes. However, if your proxies aren't banned on any of those sites, then there's a high probability that other sites will not detect that you're using a proxy. The idea is that if three independent sites have all amassed a high-quality proxy blacklist and your proxy IP is not on any of them, then it's reasonable to assume that it won't be on other high quality proxy lists like the ones Facebook, Instagram, and Twitter have acquired. To test your proxies against Leakforums, open up their URL and see if you can load the main page. If you get a screen that says "denied cakey love", then you're blocked and it's safe to assume that sites like Facebook, Instagram, and Twitter have applied strict filters to all accounts associated with your proxy. To test your proxies against Omegle, open up the Omegle URL and try to text chat with someone. If you receive a message that says "error connecting to server" or "Banned." then your IP has been blacklisted. Last but not least, Nike will reject your connection if you're on their blacklist. You'll be greeted with a white screen and an error message if your IP has been blacklisted, rather than the standard page. Remember that even though your proxy may be able to connect to all the above sites, it's still possible that Facebook, Twitter, and Instagram may have a different or updated proxy list. However, this is highly unlikely, and the point of this method is not to prove with certainty that your proxy goes undetected, but to test whether it is highly likely that it will go undetected. That's it! Feel free to leave me any questions, comments, or criticisms you may have. I realize that some of the assumptions I've made about proxies are less black and white in reality, but they will hold true for the majority of users and that's what's important in a guide.