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Morse Code
The first working telegraph was produced in 1836. This made transmission possible over any distance. The first Morse Code message, "What hath God wrought?", was sent from Washington to Baltimore in 1844. -
Telephone
Alexander Graham Bell, the Scottish-born American scientist best known as the inventor of the telephone, worked at a school for the deaf while attempting to invent a machine that would transmit sound by electricity. -
Skype
Skype specializes in providing video chat and voice calls from computers, tablets and mobile devices via the Internet to other devices or telephones and smartphones -
Twitter
Twitter is an online social networking service that enables users to send and read short 140-character messages called tweet. Registered users can read and post tweets, but unregistered users can only read them. -
Facebook
Facebook is an online social networking service headquartered in Menlo Park, California. Its name comes from a colloquialism for the directory given to students at some American universities