I suppose that they could be being moved to sub forums that I don't have access to, but it seems that they are being deleted as my post history doesn't show that I have posted in any of them. I did make a reply to the original NSA thread that ended up being moved to off topic and not deleted, but the OP reposted the thread and PMed me that it was deleted again. The other threads are either being moved into a sub forum I don't have access to or they are being deleted or dropped from the database somehow. I was a bit surprised honestly, considering there was absolutely nothing controversial in any of the threads, and I have never seen threads deleted here before, but over the past couple of days there have been at least four that vanished. Two people have talked with me in PM about it and they also have the impression that the threads have been deleted. At first I figured it might be the OP deleting the thread, but I was informed that OP can only lock the thread, and in either case one of the OP's took the initiative to inform me that he did not delete it and asked me if I knew why it had been deleted.