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Prior to 3500BC, communication was carried out through paintings of indigenous tribes.
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Tsai Lun invents Paper
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Samuel Morse developed Morse code, and later builds the first long-distance electric telegraph line.
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Almon Strowger patents the direct dial telephone.
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Radio station KDKA based in Pittsburgh began the first broadcast.
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John Logie Baird transmits the first television signal.
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Chester Carlson presents the first photocopier suitable for office use.
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The personal computer (PC) market is born
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Apple launches the iTunes Music Store and sells one million songs in its first week.
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MySpace is launched.
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What would become the largest social networking site in the world, Facebook is launched.
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YouTube, the video sharing site, is launched.
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Twitter, microblogging