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No one will believe me, but I had this feature on a BBS I wrote back in about 1986 or 1987. I cannot prove it because the code no longer exists. I had a problem user that kept posting junk to the forum. I deleted things for a while and then thought of this as a solution. It seemed to work. The user never knew that no one else could see those posts.

I believe you.

As a BBS user in the 80s I believe you. It was a common feature, usually referred to as the twit bit.

Since it is such an obvious idea which was common much later on bulletin boards, I think that your claim is believable.

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