I hope you realize most people on facebook are not there to find intellectual content. These are the same set of people who have made shows like Judge Judy and Dr. Phil and Jerry Springer famous. Vast majority of population loves cat videos and would click on "Top 30 reasons to see royal wedding". They are the one who will stay on FB for hours and contribute towards FB's impression goals. One time I was researching replies in twitter feed of Trump and other conservatives like Ann Coulter. It's purely fascinating how many people are out there with nothing else to do, hanging out there for hours on, posting stupid meme after meme for insignificant posts. You, me and crowd in general at HN is different. FB is not optimized for us and I highly doubt they would care about how we want FB to be.