Probably depends on how or where they are reading.
Stuff posted to rec.ponds and answered would just go
to rec.ponds. It is when folks reply to the troll stuff
that the cross posting seems to happen. Or am I
wrong here?

I'd almost think about having a general post on trolls
but think that would probably attract more attention
than it would help. At least to me. But if someone else
wants to risk it it would probably be a good idea.

k :-)