Sites like twitter, FB, reddit, youtube, for whatever reason always push the most rage-inducing content to their front pages. I guess it helps with "engagement", and they see it as a positive that people spend more time on their sites... regardless of the psychological consequences of having users angry.
Twitter especially, could just ruin my whole day, with the content it pushes to everyone's feeds. They really don't care about our psychological well-being, at all. Standard short-term capitalist thinking.