It began as a scattering of acid remarks within earshot of a Rolling Stone reporter. But - thanks in large part to Twitter, the Web, and cable news - barely two days after those remarks were disclosed, a media firestorm ended Gen. Stanley A. McChrystal's tenure as commander of U.S. and NATO Coalition Forces in Afghanistan.
Fast, overwhelming, decisive: It's a case study in how tightly connected 21st-century media can whip a story into a full-on tsunami, with startling consequences for individual careers and national policy.
"Rolling Stone broke the story, but it was Twitter that got the story rolling," says Aram Sinnreich, a media professor at Rutgers University in New Brunswick, N.J. "The peer-produced social media are doing to cable-news networks what cable news did to broadcast. We've gone from the one-day news cycle to every hour on the hour to second by second."