our 1 billionth customer

"Some time in 2005, we quietly passed a dramatic milestone in Internet history: the one-billionth user went online. Because we have no central register of Internet users, we don't know who that user was, or when he or she first logged on. Statistically, we're likely talking about a 24-year-old woman in Shanghai."
Read more at http://www.useit.com/alertbox/internet_growth.html