LinkedIn is closer to Facebook imo. The subreddit /r/linkedinlunatics is pretty funny, and also a bit scary.
It's pretty interesting actually, on facebook you see people show off a manufactured persona that is always laughing, on vacation in exotic or glammy places, and on LinkedIn it's the exact same phenomena but the success indicators are different.
I'm still a bit clueless on the whole LinkedIn influencer thing though. Is there some monetary gain from that? I don't think they have the same possibilities for eg ad space or sponsorship as eg youtube or blog influencers, so perhaps it's more a personal vanity thing, or selling books and courses.