I remember what made me quit facebook, way before it became Meta: the TV serie Person of interest. It gave me a big awarness of the scale of mass surveillance. I already had the project to quit because of Zuck’s shenanigans and the lack of interest i had in the platform, but this was the last straw for me.
I’m British and quit Facebook and Instagram after Brexit.
Once the Cambridge Analytica stuff came to light, and I realised how these platforms could be (and were being) subverted politically to spread misinformation it was the final push I needed.
Seeing the Covid anti-vax stuff that followed only reinforced how I felt.
I never really used twitter, and decided to leave it that was when Musk took over.
I 99% stopped using Reddit after the 3rd party apps stuff and it became clear what their ambitions for the platform were (although I still check certain things there occasionally).