8. Twitter
跟Facebook一样，推特改变了人们在数字时代的生活方式。
Often seen as Facebook's chief competitor, Twitter is really something different -- a sort of global instant-messaging system. It is used every second to alert huge audiences to everything from revolutions to interesting Web posts, or just to offer opinions on almost anything -- as long as they fit in 140 characters. Like Facebook, it has changed the way people live digitally.
推特通常被视为Facebook的头号竞争对手，它确实与众不同——有点像一个全球即时通讯系统。每一秒都有人使用推特向广大听众发送各种各样的信息，从革命消息到有趣的网站帖子，或者只是对任何事发表看法，但是长度不超过140个字符。与Facebook一样，推特也改变了人们的数字生活。