@bigbeautybummum
As has been said, I think it's just like a kind of blog/diary/virtual scrapbook. But some people post a LOT. Especially of their kids. One woman I know has a daughter who had a baby in February 2019. I have her and her daughter on FB, and between them they post probably 60-70 photos a WEEK of this child. She is a cute child, but to me, all the photos are the same. It's just the same child. 70 times a week. 
I do like them, and get on with them, but it's got a bit irksome, so I have 'unfollowed' them both, because I am bored with seeing pics of this same child popping up on my timeline everytime I log on.
I do get sick of people on facebook saying stuff like 'you find out who your friends are don't you?' Someone says 'what's up hun?' She says 'can't say on here.' 
Or the 'I have tagged all the feisty and independent women who are so much FUN! Don't be offended if I haven't tagged you.' (I won't. don't care.)
Also when people post a 'meaningful' and 'touching' post, and say 'I know who will share this and who won't.'
And don't even get me STARTED on the MLM posts. 
Me personally, I look at facebook 2 or 3 times a week, but post maybe just 3 times a month. It's good for contact with people I don't see often, but I find it a bit boring now tbh. It's a bit outdated and old fashioned now, and I am kind of 'over it.'