So, like, inherent to your question is an assumption that LinkedIn is for "something", as in, it fulfills some need.
And I'm just not quite sure that it does. Tbh, if I am hiring and I find out you are one of "those" people who are chronically on LinkedIn, I would seriously considering not hiring you, precisely because of that.
Its not clear to me what, if any, role linked in fills beyond keeping a roladex of people I've worked with but would never want to connect with otherwise. Even then I only keep a profile because of the assumption that I should. Its not clear to me thats a good assumption, because I still don't see what need I have that LinkedIn is filling that a list of names and e-mails couldn't also fill.