$5.7 billion was spent on Alibaba sites on Singles Day 2013

"China’s 11/11 online shopfest – the country’s equivalent of America’s Cyber Monday – has just finished. It’s been a record-smashing mega-sale on hundreds of e-stores. Here at Alibaba HQ, the makers of China’s top online marketplaces are celebrating the biggest-ever shopping day: a grand total of $5.7 billion (RMB 35.02 billion) spent in the course of just 24 hours.
(Update: Total unique visitors on Tmall on this 11/11 hit 402 million, up from 213 million on the same day last year). The sales on Alibaba’s Tmall involved over 20,000 merchants on its online marketplace. That massive $5.7 billion figure counts only Tmall and Taobao customers who paid via the company’s own Alipay (like Paypal), so the total spending amount will be higher once all payment methods are totalled up. The most popular store on Tmall all day was the official shop of Xiaomi, China’s upstart phone-maker."

Source:  Tech In Asia, 12th November 2013
Plus - $90m for Xiaomi
Plus - Alipay processed 188m individual payments
Plus - $877m of Alibaba's total was on mobile, up 5-fold on 2012
Previously - $3bn for Alibaba in 2012