re: Now that's irony!
"One criteria for defining spam on a BBS is posting an endless series of n/t subject lines repeating the same text."
You mean like Bowser's perfect example:
http://www.habitablezone.com/currentevents/messages/345178.html
I don't consider it spaming if you have a short reply and posted in title, but when you want to write paragraphs of information and you put all this in subject line, that seems like spamming.
If you have short reply and put it in the body, then it's wasting my by requiring me to open the post when there is only a word or two to read- I would rather it to be put in title line.