Alibaba Group vice chairman Joseph Tsai speaks during an interview at the company's headquarters in Hangzhou, capital of east China's Zhejiang Province, on Nov. 11, a holiday of "Singles Day" that has become China's busiest online shopping day. Sales at Tmall and Tabao have snowballed to 50 billion yuan by 21:12 Tuesday night. (Xinhua/Ju Huanzong)