Easy. That is the only social media site that is so comically bad, that it does not trigger me in any way with the feed. I am using it as a way to reach out to colleagues from the past - a bit like facebook circa 10 years ago.

I can't stand any of the other social media sites and have deleted accounts there years ago. So, if I need to organize a small reunion with friends from highschool, linkedin is the easiest solution.