They realize, stop using it for a few weeks/months, starts missing it and then come back again. I myself have gone through a few such cycles. This is frustratingly similar to trying to quit an addiction.
After that, every single time I think about using Facebook the shame engine in my mind generates enough repel force for me to not do it.
I didn't do that whole process intensionally. I remember seeing some meme like "checking out Facebook in the summer -- all my friends are having fun somewhere and me masturbating lonely in a dark room" and that initiated the mindset change.
To be honest, I know using Facebook is NOT a shame, but now I don't have any reason to use it at all. (There are some stupid website which only allows Facebook login, and I use my gf's account for it -- neither I nor her care about what's on her facebook.)
I did this couple of years ago and never went back.
Every time you see a vapid post, unsubscribe from whoever posted it. Eventually you'll have five minutes worth of feed every day and it's only people you're interested in. Suddenly you're not wasting time, you're just getting a couple friend and family updates with your morning coffee.
Link: https://chrome.google.com/webstore/detail/news-feed-eradicat...
I would impulsively type the URL and then the small nuisance of having to log in was enough for me to close the tab. After a few days it was enough to stop the compulsion, and now I haven't used Facebook in months.
Reddit on the other hand...