Facebook really wants you to scroll past no more than 5 posts. It will chose the "best 5" by some algiorthm, and after that it is mostly garbage. Their best 5 algorithm isn't very good, it finds the most important stuff (a friend had a new baby - these get a lot of likes), but will miss most of the next level down. Then it descends into memes that people share instead of the actual life people live.