I mean can a topic be cited in a paper (scientific or not), and if it can, how to do it?
Usually to cite, you need an author, title, publishing, and a date.
author and title .. fine. Can instead a publisher be written something like "LongeCity forum" or somethig simmilar.
If you have to define a date published or date last edited, which jas to be cited and how?
Have you seen a topic cited somewhere? How did they cite it?