Starting at 8:05 a.m. on Friday, Oct. 26, New York City communicated to residents through its official Twitter feed about Hurricane Sandy's arrival -- which wreaked havoc on the entire subway system, "in every borough and county of the region," said MTA Chairman Joseph Lhota in a statement, adding that the storm ripped out power and inundated tunnels, rail yards and bus depots.
Over the last five days, the city has tweeted and retweeted information about evacuations, road and bridge closures, power outages, school closures and blood donations, among many other things, some of which are displayed on the map above (view a larger version here).
Using Twitter during a disaster is becoming much more prevalent, as also illustrated in August 2011 when a magnitude 5.8 earthquake struck central Virginia and was felt from New York City to the Carolinas and west to Ohio.
Jessica Mulholland served as the Web editor of Government Technology magazine from October 2012 through September 2017. She worked for the Government Technology editorial team for nearly 10 years.