I don't buy it. I just moved here from China a couple of months ago, and if anything I'd say 70% is an overly conservative estimation of IE usage. Both of my banks, for example, were accessible only through IE with an active X plug-in which made it impossible for me to check my balance on my mac. The same was true of many, many other sites. Much like the US was 10 years ago, only really hard-core geeks were likely to have firefox or other alternative browsers.

As for usage, I also don't buy that. Most people in China are online primarily through their phones, but in first tier cities (which is still a gigantic population), people have bandwidth that most Americans could only dream of. Youku, for example, streamed 5 times the hours of video content as all of Youtube last I checked. And Tudou (which it is merging with) was a competitor on the same scale! In terms of page views, I'd be shocked if Amazon had as many as Taobao. No US news portal approaches QQ. Actually, Tencet (owner of QQ) is considering buying Yahoo!. The only way in which China's internet is small is in the amount of money its users want to spend on content.