The accounts already have numbers.

I suggest these could be shown on the avatars of those unsubbed.

Why?

Because the value of much of Tribe.net's content stands to outlive users and their accounts,
but it is difficult to follow threads in which more than one person is unsubbed.

If they were numbered, future analysts of this early internet data would have an easier time making sense of it in terms of who is speaking to whom.

In fact, such a feature would already be of some use to me in conjunction with the random thread button I suggested.