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This is the oldest known form of communication dating around 30,000 BC.
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Petroglyphs were the second step in the history of communications, estimated about 10,000 BC. They are like Cave Painting only carved.
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Pictograms were the next step in the evolution of communications, used by multiple cultures from 9000 BC. This form of communication became increasingly popular around 6000 to 5000 BC.
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The oldest known forms of writing were based on Pictograms, invented in about 4000 BC.
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I think this is a quite complex system, but it was used in the wars and invented in the 4th Century
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Pigeon Post started to be used in the 5th Century
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Started using the mailing system in the 6th Century
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It communicated by showing the country that the boat or ship came from.
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One form of these was the tin can phone where there was two cans attached with string, the first person would talk into a can while the second person would listen trough the other.
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Information is encoded by the position of the mechanical elements; it is read when the shutter is in a fixed position.
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The telephone was invented
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The radio was invented
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Also known as the TV, it was invented by Philo Farnsworth and Charles Francis Jenkins
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Motorola was the fist company to ever create a handheld mobile phone.
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The company now famous for the iPhone, iPod, iPad, and Mac was founded.
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Simple Mail Transfer Protocol (SMTP) was invented. All our emails use this software.
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Internet was created.
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Google launches
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Facebook was founded
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YouTube was created.
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Twitter was invented
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Apple released the 1st Generation iPhone
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Google Plus was created.