I've only read the first page of posts, so maybe this has already been covered, but here are a few considerations, considering as this thread was inspired by the Taboo in Deathly Hallows.
First, Voldemort did not innately have the ability, nor did his followers. He only gained this advantage after he had complete control of the Ministry of Magic - including the Department of Mysteries (which, among other things, created the Time Turners that could - for the wearer - reverse time itself for several hours). This, to my mind, suggests that the "Taboo" is probably the work of a magic item - a minor artifact, no doubt, if not an artifact.
It seemed to have a range great enough to extend from London to northern Scotland - so several hundred miles, at least.
It focused upon a single word, "Voldemort," and those that spoke it immediately had their protections broken and their precise location somehow displayed or otherwise granted to those working with the item. Teams were standing by to teleport upon learning of an incident.
What I find most interesting is that the tradition of calling Voldemort "You Know Who" suggests that Voldemort had gained control of the Ministry of Magic during the prior war as well - or perhaps it was merely Rookwood (his Dept of Mysteries follower) that activated the Taboo last time, or maybe stole it for his lord?