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However, this unequal coverage does not imply an intentional or purposeful under-representation. Search engines all use Web crawlers to build up their databases, so that a biased representation is most likely to be caused by technical reasons, except in certain cases such as Google Chinas current (early 2006) policy of suppressing certain political Web pages.
This study focused on search engines and websites from a few countries, as it would be impossible to examine all search engines and all countries in existence. China are the chosen search engines, while the United States, China, Singapore, and Taiwan are the chosen countries.