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IBM estimated that humans collectively produce 2.5 quintillion bytes of digital data every single day. Industry experts estimate we’ll reach a point where the number of bytes of data will outnumber the atoms on the planet. With the right tools, professionals can turn that mass of data into something actionable for a variety of applications. Cities are cashing in on this wealth of data by using it to keep their citizens safe. Social media is one of the biggest sources of information when users opt-in, but cities can also collect data from other sectors.