My experience is that you can't "convince" people out of Facebook, Instagram and Tiktok, because the platforms themselves convince people to use them. They always emit that background radiation of "You're missing out on VERY important stuff".
It's literally brainwashing by design. My dad is convinced everybody should use Facebook to be informed or they'll be "left behind". My peers are convinced you're socially a loser if you don't have Instagram. Privacy concerns are not even an afterthought.
And this brainwashing sits on top of the dopamine/reward center related neurochemical effects of these apps, which are very mild, much milder than any typical substance addictions for most people.
It took me aboout 3 months of abstinence of Reddit and HN for it to finally click that I didn't actually need them at any capacity in my life.
The blind spot is all too obvious for those with eyes to see. I can tell which app is a person's drug of choice within ~5 minutes of meeting them. Over time, these algorithm-driven apps even (subtly) change a person's personality.