Steven Johnson in Time:
Earlier this year I attended a daylong conference in Manhattan devoted to education reform. Called Hacking Education, it was a small, private affair: 40-odd educators, entrepreneurs, scholars, philanthropists and venture capitalists, all engaged in a sprawling six-hour conversation about the future of schools. Twenty years ago, the ideas exchanged in that conversation would have been confined to the minds of the participants. Ten years ago, a transcript might have been published weeks or months later on the Web. Five years ago, a handful of participants might have blogged about their experiences after the fact. (See the top 10 celebrity Twitter feeds.)
But this event was happening in 2009, so trailing behind the real-time, real-world conversation was an equally real-time conversation on Twitter. At the outset of the conference, our hosts announced that anyone who wanted to post live commentary about the event via Twitter should include the word #hackedu in his 140 characters. In the room, a large display screen showed a running feed of tweets. Then we all started talking, and as we did, a shadow conversation unfolded on the screen: summaries of someone's argument, the occasional joke, suggested links for further reading. At one point, a brief argument flared up between two participants in the room — a tense back-and-forth that transpired silently on the screen as the rest of us conversed in friendly tones.