Most of my friends loathe social media and only use it in fear that if they don’t, they might be less attractive to potential employers..
At least for me having Github page, Jypyter notebook, Goodreads profile or something similar and no FB or Twitter profile sends a positive signal.
Is "Show us your Facebook Twitter Reddit" still a thing? Yes, I am a bit under a rock.
One of the most shocking things I've witnessed my self is them scraping personal information from a google/YouTube profile and suggesting connections based on that data (I'm assuming they use some techniques to do so of you're signed into Google and LinkedIn in the same browser session)