Nothing. As is, LinkedIn doesn't provide anything that most people actually need, so you're safe to ditch it.

Unfortunately there really isn't a viable option for most people. Maybe there are alternatives depending on your field and your geographical location (I know they use something else a lot in Germany), but for most people you're really forced to use LinkedIn or you're potentially doing a huge disservice to your career.

Which is the main source of hatred for LinkedIn: most people would rather not be using it but they stay there for their careers. Others use it as a platform to promote their crazy ideas, again in an effort to make them more employable or reach out to new professional connections. It's a harsh world, but each of these insane posts makes that website a tiny bit more unbearable.