Social media isn't the only means of getting visibility, but it's a very important one.
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.