Linkedin serves a professional purpose so I can see why it’d be the most consistently searched. Like even if people don’t actively use it, at least part its purpose is for hiring managers to be able to search a person and have their professional persona pop up. It’s the most accessible way to find a version of a person online that’s not restricted or under a pseudonym.

That being said, people that actively use it for anything other than keeping their resume up to date or job search/hiring are usually nutjobs.