Communicating with individuals is only a small fraction of what social network provides. How are you going to communicate with a group of peers who all need to

Communicating with individuals is only a small fraction of what social network provides. How are you going to communicate with a group of peers who all need to know everyone's responses to your messages... by mail? Do you realize how long this will take and how cumbersome it will be? How would you make it possible for others, who weren't part of the conversation to come later and rediscover your entire conversation letter by letter? Letters aren't a good replacement to social networks if you are thinking about a pre-digital age. Newspapers that publish paid advertisements are probably a better replacement... but they also don't quite fit because they lack the function of private messaging... I don't think we have an equivalent to social networks in pre-digital world.