A few questions.
How do i check what IP i'm getting if all IP is the same? (it appears like a backconnect). Since you block access to other sites, having no way to check what the current IP is such as visiting whatismyip, how do i make sure you guys are not changing my IP or have it properly set up without leaking?
Even if you restrict access to only a certain sites, you still need to provide some fallback so that I am more certain of what I am getting. Having no ability to check for such things is a terrible thing for handling social media which is exactly what your service provides - social media proxies.
And I haven't even touched on subnets. Or requesting for IP change.