I personally came off of FB this year for similar reasons.
When I first joined at 17, FB was used amongst my social circle to plan events and share our photos from parties/bars.
Over the years as people's life's evolved, it really began to change into different types of use.
Some people never posted.
Some lurked and liked but never posted.
Some were on it constantly but sharing useful/entertaining things.
Others posted drudgery.
Others fell into the narcissism camp.
I can think of two girls in particular I had to hide, one a very dear friend in real life and the other an old acquaintance.
The old acquaintance was a marketing grad who constantly posted selfies of herself (uploading about 6 at a time from different angles of her smiling or holding her face or posed at odd angles), flaunting different outfits, all her Christmas presents, her #squadgoals, her quest for an 'elite' man, every day photos from her holidays. A mutual friend went on holiday with her and told her off for doing an Instagram story in a CHURCH. It really began to make me angry, and it wasn't jealousy, but irritation that she felt her life was so interesting. I hid her.
The second girl is someone I love in real life. She's very fun, sweet and unique. On FB, she's very annoying. Constant check ins, posts of new outfits, meals, everything always 'amazing.' When we message she's very open about relationship issues etc, but her FB is very different. I hid her on FB but we were still FB friends.
I came off FB this year because I find that although everyone does use FB differently, it has become quite a toxic, competitive and narcissistic environment. Sometimes it's hard to know what you want to do because of FB, or what you want to do FOR you. It can be very influencing and if you are going through a hard time (as I was) can make you feel bad.
If you're struggling with money, it's hurtful to see people posting about purchases.
If you're single or have been cheated on, seeing the couple hashtags can make you feel bad.
If you can't afford many Xmas pressies one year, you don't want to see everyone elses.
Plus anything you truly want to send to a friend you can do on Messenger or WhatsApp rather than send to your whole friends list.
Someone said once, would you stand up in front of your workplace or in a pub and announce something to everyone there? Or would you just say it at your friends table or to the colleagues you like? There's also things you don't talk about to certain friends. If a friend has money problems, you wouldn't send them pictures of all the bags and makeup you bought. If a friend had been through a divorce, you wouldn't send them your valentines vacation photos. I think this is the difference; social media takes out the nuance involved in everyday friendships.