Taobao reportedly accounts for half of all packages posted in China

"Taobao, the largest online retail platform in Asia, mirrors eBay but with an Amazon-like service tacked on. It has a user experience and engagement that puts its Western cousins to shame. Crucially, Taobao has overcome one of the biggest hurdles facing any retailer in China--a lack of trust--by not processing a payment until the consumer receives goods. It reportedly now accounts for half of all packages posted in China, something neither eBay nor Amazon have come close to claiming in the U.S."

Source:  AdAge, 27th February 2012

Caution - I can't find another source to back this up - can anyone help?