Good advice: delete facebook. It is an invasive spyware app used for no good purpose.
Call or visit your friends and family in person!
Psychology wise, it's not healthy, and as you say, folk are just giving so much info away on themselves.
Research has shown that folk have 3 to 5 close friends, the other 100+ on the friends list are nosey.
I was just on years and years ago.
Maybe many did, anyone you recognised from school, you sent a friend request. Then friends to a friend etc.. Before you know it, you have a few hundred friends. In time, you have a cull and unfriend handfuls at a time. My girlfriend and I hand a joint friend, a lass from school in my year. I never spoke to this ex-class mate, so I unfriended her. The girlfriend gets a message from ex-classmate if somehow she's upset me, so I added her back on. It's called estrangement.
My sister, her boyfriend called Wanker, my son, my niece (sister's daughter). Long story short, I tried helping my sister and Wanker out, but I had to kick them both out, they were stopping with me for a planned time, but he's a wanker. So a few weeks later, I called by my mother's and she said, "You lot and Facebook, causing problems". I said, "What on earth are you on about?". Apparently, I've told my son to unfriend my niece. So I rang my son and asked what's going on. As my son just left school, he deleted his Facebook account and set up a new account, but he never got round to sending invites out. So basically, my niece noticed, mentioned it to my sister. So Wanker told her that I must have told him to unfriend her because of the fallout. So I rang my niece and told her that I don't even have both sons on my friends list because if I do, photos of their mother will come up. I divorced her. So I never speak Facebook with them. She wasn't interested, no apology, and said, "I'm not interested in the petty arguements between you and Wanker". So I told her, my sister, and Wanker to all fuck off. Never spoke to them since.
And then the attention seekers, "Oh, I'm so mad". "What's up Hun". "Can't say, pm me".
And then to the idiots advertising when they were gonna go on holiday, I replied, "Thank you for the information, think I'll go and burgle your house while you're awat". Just to wind them up
So the psychologists were right, so I deleted it.
Then I got a text off my brother, "Have you heard the news "sister" has cancer of the blood". And after all the shit, there is such thing as karma.
So Facebook, WhatsApp, InstaWhatEver and so on, I always advise folk to delete them.
I have YouTube, and I don't comment on it.