LinkedIn is full of virtual signalling, low quality posts, and connection requests from what feels like bots. Similar to Facebook the platform feels setup to faciliate spam arriving in your inbox. Most content on the platform is either as simple as a Google search AI result, or just irrelevant stuff about "digital nomads", or some other trend that should be relegated to TikTok. Then you get the spam connection requests, either by recruiters who have no intention to recruit you, or by someone trying to sell you another course. The website does not feel like it is for professionals to talk about their profession, instead it feels like a coorporate circle jerk of nothingness.
Another irritating part of LinkedIn is how everything feels so surface level. You will find a lot of "We migrated database at our startup" type posts, which often fail to discuss anything of value. No cost based evaluations, no technical reasons, no graphs, etc... Often times these posts read more like a Stack Overflow page, not a tehnical blog.
It is not just LinkedIn that I find problematic, most social media suffer from similar issues. I always find these sites make it easy to "doom scroll", which for me always leads to many issues. I think that issues with social media affects a lot of people, and cutting them out is what worked for me.
Pretty much nothing. If you are a recruiter, use my email. Otherwise it doesn't mean anything.