Quit Facebook about 2.5 years ago. Deleted my account sometime in 2017 or so.
I don't use Instagram, WhatsApp, or their other products either.
As a software developer, though, React is my preferred web application framework. React emerged from Facebook and Facebook contributes a ton to the open source software that I use to make a living. I really like React and the React ecosystem, and I really credit the Facebook engineers for their contribution to web application development.
I quit Facebook because it was detrimental to my social life and how I perceived people, adding negative value to my life. I didn't really care that my data was shared with partners, or my personal information was packaged and sold as an incentive to advertisers... I always knew that's how it worked and wasn't naive to that. What I didn't like about Facebook was the actual product itself. It made me like people less. I found myself getting frustrated and mad at people who I used to like, who I hadn't seen in years, and then I'd think to mysself like "ugh, that girl is so annoying" or "ugh, that guy is such a fucking idiot" or "dude just shut the fuck up..." and it really changed my opinion about people who I liked "in real life." I found myself getting a sense of light anxiety when using the network, or when not using the network. Am I posting the highlights of my life? Am I pithy enough or witty enough? Do I need to worry about someone posting a photo of me that's embarrassing? Did I upload something stupid 10 years ago? Will my spouse, new friend, or employer/co-worker find something about me that I forgot about that embarrasses me? Am I a social media try hard? Yes. Am I still? Maybe not. Was I before? Absolutely. Should I be embarrassed about that...? Maybe... etc. It was social media anxiety as an adult. The new "keeping up with the Joneses" and the white picket fence, except you were keeping up with ... what beer you drank, what concerts you went to, what places you visited, what great times you were having... and... most of them are bull shit. The photo of the exotic vacation? You spent 60% of that vacation scrolling through your phone looking at people you didn't like writing things that made you anxious. The beer? Who cares. The concert? You missed your favorite song trying to post the perfect photo and forgot what the concert was like, save for your fake representation of it. SUre, these are exaggerations, but the anxiety of it is real.
Eventually, I realized that the social network was adding negative value to my life. I've always justified sharing my private information with Google, Apple, Microsoft, ResetEra (Etc), and others, because those products add some value to my life... I can say "Without Google, I'd have X, Y, and Z less value in these day to day activities..." and so I consider the quid pro quo worth it. For Facebook, I realized that their primary product made me unhappy, gave me anxiety, and that I got nothing from it. I used to get value from event invites when I was young, especially after college when my friends split up and moved all over, but once I was in my 30s that didn't seem as necessary anymore, and so that single hook was gone.
Stopped using it, and I became a happier person. I liked people more. I didn't have this jaded opinion about somebody based on their fake social media profile anymore. I still kept my account "just incase," and then around January 2017 I realized that I don't want to give stock value to a corporation that makes negative value in my life, and I deleted my account. I know they're still profiting off of that old data and I'm sure fresh data still comes in from my relationships to other people that the social graph has captured, but I can't control a lot of that, and so I've just got to be at peace with it.
I'm happier now.