World Map of Dominating Websites
Google is the really the world leader. It is the most popular and viewed site in most of the continents including North America, South America, Australia, Europe and good part in Asia too.
Facebook is leading at 2 with a good amount of coverage in Africa. Baidu is undoubtedly the Chinese leader and Yandex is the most active website in Russia. Twitter is nowhere in picture.
See the following world map depicting the popular sites area wise.
{click on the image for a larger and clearer view}
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