As just stated in the 'Where Did My Thread Go?' Thread:
May I suggest that the displaying of the user names of those that spammed a thread when the "The thread you are trying to view has been marked as spam." message is displayed may lessen the behaviour that is now rife in the "Misc" forum by "serial spammers".
Also introducing a threshold such as 1,000 comments, or 6 months as a member, before being able to mark a thread as "spam" may also reduce the instances.
Thank you for your consideration/comments.