Clearly no such service exists but I find it interesting that so many people share photos/do activity x y or z that claim to provide access to such a service.
I don't think I want to know, really. It's a bit like knowing who's in the toilet cubicle next to you. The dark part of my mind wants to know but the sensible part knows that finding out isn't a good idea.
If you could find out, would you?
Unfortunately I think curiosity would probably get the better of me if there was some way to know...