»Facebook and Twitter are not social networks, they are just platforms. _We_ are the social network.«

– Amr Gharbeia (https://twitter.com/gharbeia ), a few years ago at a conference, commenting on their activism in Egypt and coping with overload and unavailability of Twitter, Facebook, etc.

Also fully agree with your other points. I don’t use Facebook (Twitter though) and just email people whom I care about. Works fine, and those who really care have no problem with you not being on Facebook.