Attention is scarce. So when you combine all the resources and effort that marketing departments from Fox News to Charmin toilet paper, add Facebook as a primary medium, throw iPhones and ADHD into the mix, the only tactics that work appeal to base instincts. Make something flashy, attention grabbing, and short lived.
When that happens to ALL information, there’s no place left for balanced thinking that doesn’t come to some immediate divisive conclusion that just confirms what you already believed. There isn’t enough attention to get depth or thought provoking material in and have it win in your A/B tests.
So what happens? Democracy loses as base radicalization is mechanically forced by the attention economy to win out.