ABSTRACT
More than ve billion people are calling, texting, tweeting, and browsing on mobile phones worldwide, and 350 million tweets are sent per day (Gantz and Reinsel, 2012). Companies around the world are capturing trillions of bytes of information on customers, suppliers, and operations. The McKinsey Global Institute (MGI; Manyika et al., 2011) estimates that global enterprises stored more than 7 exabytes of new data on disk drives in 2010, while consumers stored more than 6 exabytes of new data on devices such as PCs and notebooks. The U.S. government produced 848 petabytes of data in 2009. Data collected by the U.S. Library of Congress as of April 2011 totals 235 terabytes.
