And also just to add - if you see a post that is unquestionably a spammer or a troll - could be an obvious advert or something like that -
just hit that small icon of an exclamation point in a red and white triangle in the left corner bottom of their post.
This immediately alerts the mods who can remove it almost instantly. So far we've been lucky....got a great bunch of people here, but it could happen.

all the best!