I personally don't mind the occasional fictional story on MN as some of them can be entertaining, but they do seem to have increased in number over the last year, to the point that many people are getting cynical of genuine posts.
There have been incidences in which the same poster starts two threads which cannot possibly both be true, because key details contradict each other. And I'm not talking about people changing a few details to avoid being recognised, but long, controversial stories designed to stir up strong emotions.
Am I right in thinking that this is allowed under MN rules, but that warning others not to get too emotionally involved in a story because it's likely to be fictional is against the site rules?