The part I'm raising an objection about is "[that it's] not a place for serious things". It's in many ways key to being able to do serious things, if used deliberately. It's the mindless consumption part that is bad, and the point of my original post is that you can largely engineer that away.
Let me clarify. I'm not saying serious things aren't happening there. I'm saying serious things don't belong there. You're doing serious things there despite the fact that it's an addiction machine engineered for mindless consumption. You're at the casino selling to the gamblers while they're gambling because it's the only place in a 50 mile radius where people can hang out.
I'm not talking about lowercase social media which is generally socializing online. I'm talking about the massive survelliance and engagement bait economy that props up these horrifying data behemoths that cynically run these networks for giant profits.
You're there because you have no choice. You have no choice because that's where everyone is. That's where everyone is because of inertia, addiction, and novelty.