Well, one can control oneself, that's about the best we can do. As others have mentioned, don't use it.
I tried that. After years of not using FB at all, I missed out on some important news that was only posted there.
I decided to get back on FB, on my own terms. I created Bubble [1] and now I can visit FB with most tracking disabled, no ads, I only see posts from my friends, and even then only posts that do not link to news websites or contain political keywords.
My signal/noise ratio is usually about 50%. I love my clean feed. Works on LinkedIn, Twitter, others.
But the root problem goes deeper -- clearly not everyone cares or has the motivation to filter their own social media feeds. Some people like reading echo-chamber/fake news posts, truth is far down on their list of priorities.
I don't know what the big-picture answer is.
[1] https://getbubblenow.com (currently in beta)