I didn't see that feature yet when trying to report a message/topic on Community Central to admins/moderators and any wiki communities that have Message Walls feature enabled that (I think) is considered spam, inappropriate, or unwanted.
What about "Report this thread" feature to be available in messages on the next Wikia major update? Allowing you to report threads and replies to admins/moderators that was spam, inappropriate, or unwanted.
As I looked over when I joined Wikia, we no longer removing threads nor replies from their message walls, as two years ago I see is that feature is still available for removing until now.
So this blog, I'm asking Wikia Staff members and Wikia Developers about reporting messages here.
Comment here if you have any questions about reporting messages.