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You're claiming that something I dont care about is affecting my life in subtle ways I dont realize.You don't need to care about something for it to affect you. Do you need a citation for this too?
I'm claiming (actually merely stating, this is more like "water is wet" that some claim that needs support, it's almost a tautology) that systemic/social effects (what most people do, even if you don't do them) affect people in a society even if they don't participate.
Specially that the majority people using social media also affects people not using them. Because even if you dont use them, your friends, kids, relatives, colleages, etc, do.
The effect ranges from people simple things like people driving the car in the same roads as you while checking their feed, people staring at their screens when you go out with them, to friends/spouses/relatives/colleagues/kids being addicted, depressed, manipulated, misinformed, and generally affected in multiple ways by social media in many ways that then brush of to you (except if you live in a desert), to others expecting you to be participating there and treating you weirdly if you don't, and several other ways besides.
It's the same way for many other things that are seemingly "individual" choice. You might not care about alcohol or drugs for example, but if somebody in your circle does, or even someone you have the misfortune to meet, it can just as well affect you (or their friends, relatives, violent crime rates, the health system, road safety, etc.).