Putting aside all logical arguments for and against Linkedin and other social media, when I do force myself to log in to my account, I find myself peering into the abyss of thousands upon thousands of people trying to game the system and "advance their careers", which they presumably do well.
To me, it is the essence of the rat race that I try my best to ignore in my daily life while I try to balance time between my hobbies and work. I know fully well that the rat race takes an interest in me too, but it is so, so incredibly devastating to me that so many people to engage in hours upon hours, days upon days of "grinding", smooth-talking and evangelizing just to sell what essentially amounts to metaphorical snake oil and rake in as much cash and favors as possible. People seem to either support and praise these acts to high heavens, or simply excuse it. They do it because "that's just how the world works" and "that's just how people and businesses are", and they're right.
I feel like the answer the world gives me about my discontentment is "There's more to life than the rat race, idiot, but you better come up on top of the rat race or else you'll be a poor, irrelevant loser! It's what life is about!" - There is perhaps some truth to this statement. After all, grand structures and monuments are not built by people who "just want to have a quiet, peaceful life". It's even more true now that it's quickly becoming a de-facto prerequisite to having a career in the first place.
My coping mechanism has been to shut myself off of all noise and simply focus on what matters to me and what matters most for my continued sustenance. One of the measures has been to basically access my Linkedin account only a few times a year, mostly to accept new connection requests. It has worked reasonably well, I'd say. Maybe I'm shooting myself in the foot by not having an entire large-double-digit-number-network of people that can hand me a job if and when I get booted, but it's a risk I'm willing to take for my mental health.