alt Hacker News>If you use this method to kinda-sorta locate or identify all the users in your group and one or more of those users ends up being located in a region where you should have no active group members then you may have identified a mole in your network.
...unless they happen to be using a VPN for geo-unblocking reasons or whatever.
If you're in a group like this where people are seriously concerned about their location being discovered by governments or by their own contacts, anyone in that group who is not already on a VPN all the time is either ignorant or nuts.