Comment by visakanv

I wouldn't use the term IQ, it can be a bit misleading. High IQ individuals can squander their time arguing about frivolous nonsense (I went to school with a couple of guys like that). Average IQ folk can be thoughtful and engaging.

What's happening is a kind of evaporative-cooling effect- specifically, the very natural rise of cheap wit and sensationalism. These things trigger upvotes more easily. Pithy answers and responses get rewarded quicker by larger crowds, and this discourages the carefully-evaluated-and-reasoned answer.

We don't have to bring IQ into the picture when making sense of this phenomenon, so let's not do that.