Okay, I've read the thread now. My previous message is very relevant; this aspect of the forum page should be redesigned (or returned to the older format where we were asked to try an archive search before posting a new message)
Joe, for the reasons that Katlaughing and Malcolm Douglas gave I think you should be sparing with your cleaning up of the threads. Also there can be something annoying about returning and finding one's thread titles and messages altered. I agree with Ebbie that you tend to overdo your work. I suppose we all would have somewhat different discretion of what should/should not be moved, altered and deleted ... I certainly agree that a message that only says "refresh" is not worth keeping ... but I would say if in doubt leave alone.
somewhat related idea:On some forums, all logged-in members are able to delete (Yahoo groups) or edit (smartgroups) any messages they have posted with the same login.