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I think it's the first because it's the first public "method" of comunication with other people from the same city, country...
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Graham Bell invented the pone, in Boston.
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Was created by Heinrich Rudolf Hertz.
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First large radiotelephony betwen USA and UK.
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Was created in the Bell Laboratories.
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Was a network of computers.
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It was in USA, with electronic elements.
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It was called SIX DEGREES.
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For me this is the last thing because now a days it's the most popular social network of communication.