No clue. I would think my first post would've been in Tarot Decks or UTC, but I've posted more than 1000 times in each of those forums and can't think of any way to get around the 1000 result limit.
My first post was in "Your Readings" where I put up a CC reading I'd done for a friend and asked about the 9 of Swords-rx. That was on 1 Sept. 2002. That was quite a while ago. I'd already been studying and learning on my own for almost 10 years at that point and was still a rank tyro. I've sure learned a LOT since then - enough to have an idea of just how much more I have to learn!