[yorwba]

> users of social media usually post stuff because they want everyone to know about it

> it's just not as comfortable when your grandmother and high school teacher can see you on Facebook

I think most posts on social media are targeted at people in the poster's peer group, and the only reason that everyone else can see them too is that broadcasting is the default way to contact multiple people without prior coordination (say, by joining a group chat).

[horseLOGIC]

I don't actually use Facebook, but I'm under the impression that you can post to just the people who are your friends or just a set of friends. There's certainly the possibility to at least not broadcast to the whole internet.