Recently, another zombie reviver (revivor?) poster posted on a thread and picked out loads of comments and demanded answers from those posters. Who had last been on that thread more than two years ago.
I, trying to be helpful, pointed out that it was a zombie thread and the other posters on the thread may well have left/changed name/etc etc. The zombie reviver poster (who, to be fair, I think was posting more in misguided but good faith than our current ZR) said that thanked me but wanted to have the conversation.
But why not then just start a new thread?
And as pp's have said, there's a message from MNHQ pointing out that such threads are zombie threads.
So, it's just tiresome community disruption.