XKCD on Earthquakes 

Yesterday, the east coast of the United States has a relatively small earthquake, centered in Virginia, but felt as far north as parts of Canada. Shortly after, a prescient comic from 2010 was widely circulated online.

XKCD Panel
Tweets can outpace a quake.

Today, Randall has some follow-up, along with a fantastic story about physicist Gerson Goldhaber.