Double eleven day

Today is November 11th 2013. It is well known in China for it's date as "11 11". what is the meaning ?
we know that 1 is a single one , so 11.11 are fourfold one, it implies that you are fourfold alone.
It's a day for single man or woman to celebrate their bachelor life , so it also called Singles Day.
As more people join in the celebration of this holiday, it has become a great opportunity for restaurants,malls and some entertainment areas.The well known shopping mall called Tabao.com , its turnover have been up to 19.1 billion RMB today.
Because there are many discounts things offered in on taobao.com , I had have buy bought a tripod for me for myself.Yeah~