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In the days following the Jan. 10, 2010, earthquake in Haiti, chaos prevailed. Transportation was limited, if not impossible. Lines of communication were broken. A few radio stations continued to broadcast, but the disaster’s scale was overwhelming. Only one form of mass communication remained relatively intact: cellular phones. Even before the disaster, there had been only 108,000 landbased telephone lines in the country, compared with 3.5 million mobile phones. After the earthquake, mobile communications, particularly text messages, were one of the few means by which people could report their needs and location...

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