Facebook and Youtube both seem to obviously be optimising for the wrong metrics. It's really unfortunate, their original versions were much more fun to use and

Facebook and Youtube both seem to obviously be optimising for the wrong metrics. It's really unfortunate, their original versions were much more fun to use and probably easier to code, but they have sufficient network effects that any disruptors will have to be not just a little but a lot better to replace them, even as their quality drops.