>> "LinkedIn is great if you just want to endlessly socialize with recruiters"

Why do you socialise with them? Every few days I check in and accept all connection requests (almost all recruiters). I have email notifications turned off so their messages to me just get ignored. Then when it came time to find a job I replied to three or four of them with my requirements, picked a few companies I liked from each, and had interviews setup. Much more efficient than me having to find these companies myself.