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Computers are one of the most important technological inventions in human history. They have changed the way we all live our lives in a variety of realms, including: social interactions and communication, work efficiency, marketing, media, and shopping.Communication and social interactionsComputers first revolutionized communication with the development of e-mail. Instead of time spent for mail delivery, messages were sent instantaneously. Email has been followed by instant messaging, which was popularized by America Online (AOL).

http://www.youtube.com/watch?v=q27TzT6Zr6w

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National Telecommunications and Information Administration

Social Network Sites: Definition, History, and Scholarship