I left LinkedIn over a year ago now and it was one of the best decisions I've made.
It was worse than Twitter from my experience.
Most people on LinkedIn have made a living from extracting value instead or providing it.
They live on a different planet (mentally) and are way too far away to even bother with.
Save your time and energy for the people who want to learn.
Even a response like this (very well written btw) falls on deaf ears.
It's maddening.