Some one mentioned spambots, havent seen that as well. Where can i find those spam posts?
How a post is considered spamming is debatable, if there's anybody here that can describe about how does a post considered spam, I would like to listen because I too didn't know how does a spam measured. But I do know that a non-constructive post can lead you into trouble or make you end up being kicked from any campaign. Here's one good example of non constructive user https://bitcointalksearch.org/user/iamnotcool-70247
If you like, you could also see mexxer-2 signature, s/he has a link of spammer list
A post with just 2 or 3 letters is considered a clear spam, actually not only 2 or 3 letters but less then 10 letters because it is obvious that someone cannot do a constructive post with less then 10 letters,and also as you said off-topic posts are also considered in that way, whether your post is constructive or 4 lines long but if it is off-topic it means it is meanless and considered spamming. If a user keep posting those spam posts like "thanks , sorry, hi" etc, he/she should be banned from campaigns, in that way campaigns will always be clear of spammers.
Yeah but this is being corrected. Those off topic threads are banned now so all this posts no longer exist