I don't mind joint posts, people. How could I?
But they just kept writing and writing and writing. I left them up to their own devices, and a day later, I go back to check on them, and not only did a third person join, but it's practically two substantial posts long.
So one of the original two participants may as well post the first part since they've grouped themselves together and chatted for so long, let the rest of us form our own conversation and react to whatever we heard from their first post, and then with a couple relevant edits the second post is ready to go.
All the while, Forget-Me-Not needs the same amount of activity to match the time that would have passed on SA's end, which shouldn't be too much of a hassle if members interact with each other and actually have a decent conversation.
But I suppose that's why I'm GM.