Shortly after 12:46 am EST on February 11, when a massive 8.9 magnitude earthquake hit off the coast of northeast Japan, Twitter began to reverberate with posts about the catastrophe.
"Major quake shakes Japan -- preliminary M7.8," tweeted Martyn Williams, a reporter and bureau chief for the IDG News Service. "JMA warns of tsunami, up to 6 meters off Miyagi coast."
"Wow, that was a crazy earthquake... ran out of the building. 7.9 at epicenter," posted tech blogger Chris Latko from the scene.
Read the full report Twitter Responds to the Japanese Disaster on the Pew Research Center's Project for Excellence in Journalism Web site.