In the early days of the internet, communication was by email. Originally siloed by companies like Compuserve, AT&T and Sprint so that messages could only be exchanged with others on the same system, email is now ubiquitous. Pretty much anyone can communicate with anyone else without worrying about app or device or browser.
Today there are additional methods of communicating via the internet, such as chat and voice. These new methods, however, are currently similar to early email: siloed by different vendors so that users can communicate only with other users on the same system.
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