We don't use Taobao or Alibaba. The most popular online shopping site is definitely Amazon. eBay is also pretty popular, but it's more for people who want to sell things, not companies. So for example, if I had vintage shirt I wanted to sell, I could sell it on eBay. Amazon is more like Alibaba.

我一般都在亚马逊 (Amazon) 上面买东西， 偶尔会去 eBay。 衣服的话就有很多不同网站了。