When you click “Flag” on something (which moderators encourage us to do if there’s a problem) you have a choice of what kind of issue it is. Eg, I got my “Flag Badge” for a spammer.
If you pick anything except “Message this user”, it counts as a flag. With enough forum clout this hides the post and puts up a warning message about this being “hidden by the community.”
What’s the right procedure when you’re trying to get a mod’s attention but there’s nothing wrong with the post? Why does “Some other issue, let us know” automatically hide it? I ran into this when I was trying to quickly inform whatever mod was available about the Dropbox issues someone reported, which then counted as a flag on that poor person’s record.