Facebook is said to be rolling out changes to how content is selected for each of us to see in our news feed. FB will show us content that their algorithms believe is user generated (versus that from publishers), and which has been shared, liked or commented upon. Other posts will apparently see lower priority and less visibility, meaning, they sort of disappear.
Facebook says this should result in seeing more personal posts from actual FB friends. FB is trying to discourage “passive” reading of posts and wants to push people to interact more. I suspect they are pushing towards interaction because passive reading provides them no data on your interests. By leading you to click Like, Share or Comment, they can detect your interests which they use to refine their dossier on each of us, to improve the marketing of products and services to us.