Two members recently asked me about flagged posts. They each received an email from the system indicating one of their posts had been flagged.
As the automated email indicates, any member of the community can can flag a post and mark it inappropriate, spam, etc. Once flagged by a user, the post is hidden and the author receives a message explaining he may edit the post and the post will be restored. If it is flagged again, the message is hidden until a mod reviews it.
Any time a user flags a post, a notice is sent to the mods. I often restore flagged posts as I see no reason to remove it and disagree with the reason it was flagged.
Unfortunately, posts are often flagged when a couple of members are bickering and they flag each others’ posts as inappropriate. A couple of days ago I restored one of Dirk’s posts a member had flagged merely because the member was annoyed /disagreed with him. There being nothing wrong with the post itself I disagreed with the flag and the post was restored.
I hope this helps.