You're being downvoted for making the point a bit obtusely, but the general point is spot on. This culture of broadcast sharing with some imagined singlular hivemind is an opinionated policy, and certainly not the only way of socially interacting. Many people view different groups of friends as disparate communities and don't appreciate the social context collapse of them mixing. And even if everyone is friends, more people coming to an event doesn't always make for a better time.

The one-community broadcast-everything model has been embraced and encouraged by these surveillance-based businesses who don't want you to think too hard why they are also privy to all of your communications, and also want to drive the maximum number of interactions for "engagement" metrics. Non-corporate social media, "indie" web, and group chats are much more natural organic patterns of communication.