When you post a link on a website, the proxy is used to hide your real IP and your identity on the Internet. Sometimes, for whatever reason, you just don't want to be traced back to your true location. The following services can be recommended to archive.
Proxy-N-VPN (Coupon: 15% discount on Special Discount)
Rayobyte Proxies (Formerly known as Blazing SEO coupons: GSAPROXY gets a 5% discount)
Cold Proxies (Help solve recaptcha)
Shifter Proxies (Formerly known as Microleaves Proxies, according to what is said there, the world's largest proxy network)
PrivateProxy.me (Coupon: GSAPROMO )
Proxy-Store (Get a 5% discount on thxCE6gG through this link)
Proxy-Seller.com (Coupon: 25% discount on GSAONLINE25)
WebShare.io Proxies (Provide direct API support in GSA tools)
SWiFT BackConnect (Provide direct API support in GSA tools)
SolidSEOVPS Proxies (It's useful if you also have their VPS)