Rules:
- ONE guess per person.
- Once a date has been chosen, the first person who guessed it will own that date, so if someone else chooses it, that person will not win.
- Only members who've been here prior to 21st October 2012 may enter.
To help you with the guessing, I can tell you that the signup rate is somewhere between 120 and 1000 people per day

Guess away!
EDIT: We need a date only, no specific time is required.