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In my circles (software dev in europe) everyone is on LinkedIn and a LOT of recruiting goes through it. I don't like it at all, but it is the status quo for recruiting in many countries.

IT generally, yes. anything else - i have not met anybody who actually uses it. most/all have a basic, outdated profile, didn't log there for 3 years, and 0 activity. job search is done in other ways

I think it being the butt of jokes could be isolated to the tech crowd. You're not going to find much value and definitely be more critical of it if you aren't hurting for employment opportunities.

I'm curious - what do people use now to find jobs? I'm still relying pretty heavily on LinkedIn for recruiters to contact me.

No, people at all levels in engineering and manufacturing use it. It's odd for me to search for a coworker or potential employer and not find them, although some just have an empty profile.