I have seen 2 instances where posters are either scammers, spammers or fake. In On Topic, pork sausage recipe, a poster from New Delhi has link in his post that is suspicious. I can't remember the other one but I believe it was in the deer hunting forum.
Posts ate not moderated in real time. The moderators get to them as they can and some things will slip through.
Please have a look at the bottom row of controls on each post. The "Report" control will allow you to call administrative attention to any post. It will be looked at and any action that is required will be taken.