The technology exists. It would not be hard to put it together.
Problem: technology is neutral; it can be used both ways, and would take our culture somewhere we don’t want it to go - crowdsourced elimination of anonymity.
I could put it together in a few weeks, but balk at the monster it would soon grow into.
Expect it in the near future. _Someone_ will make it happen.
I fully expect the left to use such technology. It is a natural outgrowth of their ideology.
As with that newspaper which listed the names and addresses of licensed gun owners a few years ago.