Looking at the dates of when everyone signed up I would have to say July 24th! That was the first day that a bunch of people started logging in!
I thought I remember reading in one of JZ's post that the site didnt go live until sometime in August and the earlier joined dates are from you all that were testing it out.
That's probably right but if you look at the member list and sort it by date a ton of people were signed up well before the real launch!
