It's Reddit. There is no way to gauge user competencies and most of them suffer from acute Dunning–Kruger effect. I wouldn't trust anything read there as more than mere theories. It can be convenient to find serious resources (books, papers) but most of the content is garbage.
It is AskHistorians, a very strongly moderated sub-reddit where comments get deleted if they can't show valid sources. The discussion is much higher level than here on HN.
