One thing I would like to see is an algorithm based on expressed rather than revealed preferences. De-jargoned, that means clicking the like button means I wan

One thing I would like to see is an algorithm based on expressed rather than revealed preferences. De-jargoned, that means clicking the like button means I want to see more things like that, and the dislike button means I don't want to see things like that. If I watched something all the way through, but clicked the dislike button, that means I don't want to see things that produced a similar response from people who tend to react the way I do. This kind of algorithm is not going to increase watch time over the short term, and might not over the long term either, which makes it unlikely to be adopted by any for-profit service.