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Baidu was not included in this study, as it is purely a Chinese search engine, and the focus of the study was global search engines.
However, not all local versions of a global search engine work this way. Google China imposes political censorship on its search results and explicitly states in its results screen that part of the search results are omitted to comply with local laws and regulations.
Google China was not included in the study because at the time of data collection (summer 2005), Google China did not exist. Yahoo.