I still am a big fan of Quora. There are a lot of great engineering and maths question/answer threads I enjoy reading on there when they show up in my inbox.

But you're absolutely right that more and more I'm receiving notifications of questions like "What do Liberals do for fun?" "Why do Liberals hate Donald Trump so much?" etc, etc etc.

Obvious trolling to spark anger, snark, or vitriolic response. It's toxic, and a damned shame.