Low maintenance, easy to ignore, clear purpose. I can use it to stay connected with colleagues without seeing photos of their wedding or baby pictures. There's no wall where people can publicly write to me, I don't get notified when it's my friend's birthday, my friends can't tag me in photos. I don't like the LinkedIn newsfeed very much but at least on mine I mostly only see people who have changed jobs or see jobs that are hiring.

I guess in general that being connected with your friends is a really useful tool, but Facebook does so much to try to keep you engaged that it becomes draining.

And yes, the more that LinkedIn tries to mirror Facebook or force engagement, the more I resent LinkedIn