It turns out that this Twinity issue has been known for a while
Oh dear, in the Second Life Universe it can be suggested that "Twinity is such a poorly-used system that most people wouldn't care about it"
Well ok I don't check it all the time. But it is in my head somehow. It might continue ok with apartments and mythic places and a memory. But I don't see why map makers should object.
Fact. I bought a map of Berlin a couple of years ago before the map was placed in the corner. I also bought a Singapore guidebook. Could there be a sponsor somewhere? Here in the UK I find the Ordnance Survey turn up quite often at trade events. Has anyone explained how virtual worlds could assist sales?