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The news quickly spread to some parts of Asia, North America, and Europe. Facebook penetration in South America and Africa is noticeably lower. Although the actual map used is quite old and thus inaccurate (the Soviet Union was disbanded two decades ago), the data overlaid on top is quite interesting.
See Emil Protalinski's report, How news of Japan's earthquake, tsunami spread on Facebook
More users in Asia start to post on Facebook about the event.