Blocking legitimate posts?
Facebook are already doing that themselves with their constant switching people to the "Top Stories" feed and selective display of items in the "Most Recent" list.
E.g. SWMBO says to me "Why didn't you like my latest cute discovery I posted ten minutes ago?" and yet it's nowhere in my news feed. I go to her page to feast mine eyes upon her missive and have to wade through half a ton of "Posts I may not have seen yet" and stuff from two days ago before finally finding the post from ten minutes back.
Curation, my ass.