Social media is either private or public according to how you choose to make it. You can have your IG posts set to private and only those who follows you see t

Social media is either private or public according to how you choose to make it. You can have your IG posts set to private and only those who follows you see them. You just have to make sure those you accept their follow request are people you want to share with. Same for Facebook. One can't have 5,000 Facebook friends and worry about their content being public when you chose to accept friend requests from thousands of people you don't know. For a very very long time, my Twitter feed was my private journal for things I didn't want to forget because my account was private and wouldn't accept follow request from anyone while I'm able to follow accounts that interests me. This isn't Facebook's problem as far as I can tell.