The Boston Police Department's Twitter log showed the positive side of social media. It was updated minute by minute in the aftermath of the bombings, often with instructions to avoid certain areas, or with information about where police officers might be stationed. It was also a source of information on Friday as police warned residents in Boston and surrounding communities to stay indoors as the suspects were sought.
Other social media sites were also useful sources of information. For instance, Google set up a Person Finder, as it did after the Japan earthquake two years ago, to help people connect with friends and loved ones after the incident.
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