Zombie's not sure whether HQ start an official one or whether one of the recipients does and that then gets adopted as the 'official' thread. If she recalls correctly, once it is up it's stickied in Active Convos.
Hello hello, Santa Claus is coming to town! It's official, he's left the building. In years gone by the Thank You thread has been started by a Mner and everyone's posted their messages, so it's been a bit organic. This year we've gone techie with tinsel and so we've created one here Ho Ho Ho.