Email is the granddaddy of seemingly frivolous Internet applications. "It was an afterthought on the original internet. It was not part of what they sold to ARPA," says Shirky, an adjunct professor at NYU's Interactive Telecommunications Program and an Internet consultant for Nokia, BBC, Lego, and the U.S. Navy. Email was just a simplified file-sharing program. But within 3 months, email was 70 percent of traffic on the fledgling Internet.
It wasn't because email was a fast way to send a message to someone, or even that it was a fast way to send a message to a lot of people—there were already ways to do both those things pretty efficiently. What really made email take off, says Shirky, was the Reply All button.
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