Originally Posted by AndyL
OK how about some maths :)
If two people are arguing, replying to all of each others' posts in a tit-for-tat fashion, then posting will proceed at a static rate. If 3 people are involved, then the posting rate will increase exponentially by powers of 2: the first post will get 2 replies, then those will beget 4 replies, and so on. If 4 people are involved, then the posting rate increases exponentially by powers of 3. For 5 people, it becomes powers of 4, and so on. So one less person involving themselves in the argument can make a significant difference.