I would estimate I started lurking here pretty soon after things got off the ground, I remember back in the day people advertising Tainted World as a replacement for the Batsu download forum which it's now-infamous admin Kevin decided to take down after being told off by someone or just having some stroke of paranoia. Either way, as long as Batsu flourished I only used TW for downloads and once that forum started declining and I simultaneously had some harsh encounters over there I went into lurker mode for several years. I decided to make my comeback only in 2012 at the insistence of other members here ( @Biopanda and @allisapp) and started hanging out regularly in the chat primarily, which is why I'm sure I'm most familiar to the chatbox crew.
All things considered, those years when the chat had it's most intense activity, were truly great. Like @Disposablesaid, it was a short (I think less than two years?) but very intense period and so many things passed by. There was the DemonAndroid drama involving his many cousins of unknown provenance who always seemed to provide "legit" (read: Youtube) rips of wanted CDs. Then in the end when his transcodes got banned all he could do was ask people to come upstairs.
I remember the guy from Colombia who hung out for like two weeks and talked about trains and raping corpses. It was a strange little parenthesis but I remember it well for some reason.
There was drama back and forth with Ryu/DarkWater/tons of other alt accounts, long speculations and teasing about what sai actually looks like, discussions about angura rarez in the old old Skype chat that caused Prism to ban me and a bunch of my friends... Zess and his ever shorter username. I'm sure there's more but it takes time to remember everything.
There have been differences in opinion between how a forum is best run to be sure between myself and some of the staff, culminating in the revolt and finally break which I helped facilitate. But ultimately I think this forum gained a lot from that event. Just like the protestant reformation forced much needed changes to the catholic church, this place underwent a lot of changes for the better after that and I can honestly say right now that I'm quite happy with the way things are. I've met a lot of amazing people here and I can honestly say that it really has changed my life for the better. If anyone still have hard feelings from those days, I hope we can move on and hopefully face the coming years as a community.