Re: How much !!!
"I can't even remember how many times I created throw away accounts because I wanted to look at someone."
Conversely, there are certainly people out there whose "links" have been accumulated purely because their real job is the sort of public-facing activity where it is helpful to have a significant presence in social media. It's not *used* for anything. It's just something that people in certain professions need (apparently) to have these days.
Like all social media, the data in LinkedIn is worth what the people who contributed it have spent gathering it.