Way way long ago I didn't finish responding to some forum comments that I meant to respond to, because I ran out of time/energy/brain/thingummywhatsit logic.  Since then there have been a lot more comments I have meant to respond to and I haven't managed to do that either.  But here's a start on the end of  the thread that followed 'A few days ago this happened on Twitter':

 hedgehog wrote in response to my: