Thinking you can blast something on social media and your friends and family will see it is an old mentality. Even non super tech-savvy people know now what the algorithms are, and they know that everyone regularly misses updates from everyone else.
And that light connection to people through social media wasn't a thing that created "close friends" anyway. It add to those weak connections that do have value but I doubt many people create intimate friend relationships solely through social media.
Maybe part of the seeming increasing anxiety of society is that we don't have friends in the correct sense and instead we have "friends" in the "just another user ID attached to a database query for your user ID" sense.
And that light connection to people through social media wasn't a thing that created "close friends" anyway. It add to those weak connections that do have value but I doubt many people create intimate friend relationships solely through social media.