Apparently, Alibaba and 360buy have begun to block ecommerce search engines from crawling pages and indexing content. As an example, Doug Herman points to ChinaStock.com, a Chinese consumer shopping Web site that blocked eTao, a ecommerce search engine, from crawling its pages. The linked-to article suggests the roadblock is likely the result of a "sharp drop of 360buy’s traffic." Alibaba also blocks Baidu from crawling its Taobao and Tmall e-commerce sites.