One of the most important and influential forms of communication using different technologies would be Morse Code. It is the use of sounds to send messages. It does not use any actual spoken language, but it can be decoded. Another way of communicating using technology is the concept of Geocaching. People leave crates or boxes in hard to reach places, with messages and sign-in books for people to find, then they post the co-ordinates online so people can find them.
Here is a quick video about Geocaching: https://www.youtube.com/watch?v=xE-zMPhiAi0