Ok, this is not going to be a well formulated question, because the concerns behind it are nebulous in my own head.
Some assumptions I have, that clearly inform the question that follows: I believe commercial, state, and others have sophisticated methods of influencing what I see on social media and thus, in part, what I think. I also believe that someone more willing to believe in the types of conspiratorial beliefs I’ve just expressed are more likely to be manipulated by information they’re exposed to. And, yes, I fully appreciate the irony of those beliefs.
My child is adult enough that belief patterns I encourage are very unlikely to become deep patterns. That is, I’d have to work to indoctinate my son, and he’d actively resist if my indoctrination was outside of societal norms.
He didn’t grow up exposed to the social media I suspect children do now.
How does a parent inoculate a child to the influence of social media without also creating a mindset willing to believe in a nebulous “them” that controls things—a mindset, I believe, that makes a person more likely to be controlled?
Teach him early and remind him often about how to vet his sources. Things like making sure you know who’s funding what you’re reading, what the political reputation of the sites you’re reading on are, and so forth.
Honestly, this is probably the single most important internet skill that exists, second only to (maybe) information security / data privacy, and I didn’t get my first serious classroom lesson on this until I was in my Master’s degree program. This is a skill people need from goddamn grade school these days.
Yes, it can be tedious, yes it can be exhausting, but if you want to understand who is, or could be, pulling your strings, you have to understand how to vet your sources. Never learning to do this is the path to Fox News viewership.