I have a profile up on linkedIn which I update occasionally, and never see any of the posts or social media aspects of the site. I'm not sure if another site is needed, you can just not engage with it.
I dislike the pretense that bad things happening is somehow good. Or when someone does something that everyone else has done a million times before (like graduate with a higher degree or get into law school), it is somehow newsworthy. I think it makes sense to share highlights of your life with people who care about you, not your professional acquaintances. I want newsworthy and informative items, not feel-good memes or self-congratulatory posts. I also dislike the evangelists who pretend their X thing will save the world and cure all its ills. Yuck.