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4 From a business perspective, there are 7 billion: U.S. Census Bureau, Demographic Internet Staff, “International Programs, International Data Base,” accessed October 15, 2012, http://1.usa.gov/1-worldpopinfo.
4 Roughly 80 percent of the world: World Bank, World Development Indicators 2008, 2008.
4 yet more than half the global populace: “Press Release: ITU sees 5 billion mobile subscriptions globally in 2010,” http://hddn.ps/1-ITU5billion; Richard Heeks, “Beyond Subscriptions: Actual Ownership, Use and Non-Use of Mobiles in Developing Countries,”