Oh, you can view user profiles and input the number profile you want to view to see people's join dates in order. Doing that, you find out that the first non-cryptic person to register was this guy. If you change that 16 at the end of the URL to different numbers, you can see who joined when.
That's very telling. As I registered on the same day as #16. I'm #4123. Much interest the day that this site went public.