I find the performative aspect to makes LinkedIn the most charming out of social media "cesspools", actually. The often vapid content and the professional personal branding exercises and optimism narratives are at least positive compared to the culture wars being fought on Facebook and Twitter.

Quora is just as much of a cesspool, except more frustrating because casual users are actually expecting to get something out of it, as opposed to people posting productivity listicles on LI.