I generally agree with what you're saying here -- I don't mean that "other people ACTUALLY care."

I suppose -- I'm trying to explain why I believe the choice, and thus the material itself, to post LinkedIn might be special in a way that the rest might not?

Like I'm guessing a lot of people do fall into the "spotlight effect" and that affects what is posted.

I disagree completely. If you post something racist on LinkedIn you're probably going to lose your job. Try it, if you don't believe me. If you post something racist here you're going to get downvoted.