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Sending smoke signals along the Great Wall of China, inaccurate
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People all over the world were able to write letters to each other, took lots of time
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Invented by Samuel Morse using the morse code.
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The first telephone was invented by Alexander Graham Bell in 1876
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Invented in 1982 by university students, only one person can use at a time.
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Facebook was invented by Mark Zuckerberg in 2004, many social media apps have been invented since.
