Unlimited Access. Try it Today! Your First 10 Days Always $0.99

Social media and emergencies

A woman wearing a Boston Marathon 2013 jacket cries as people gather in the Boston Commons for a vigil on April 16, 2013 in Boston, in the aftermath of two explosions that struck near the finish line of the Boston Marathon on April 15. Don Emmert/Getty Images
This photo is featured in these articles: