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This study explored the language and inlink factors to some extent and conjectured about the age factor but did not find a convincing cause that could explain the differentiated coverage. While it is difficult to determine what other factors caused the differentiated coverage and what remedy, if any, should or could be made, the differentiated representation itself is a cause for concern, given the political and economical significance of search engines, as discussed at the beginning of this article.

As the Web is constantly changing, so are the databases of search engines. A clear conclusion from this study is that search engines have undergone significant changes over the years. Compared to findings from Lawrence and Giles (1999), where major search engines of the time covered no more than 16 of their sample, the current generation of search engines covered a much larger portion of the Web in general.