Thank you CJW for the link. I honestly don’t know how people are still seeing this as a “problem” — either unfriend people you don’t care about (i.e. acquaintances you’ve lost touch with, former co-workers, etc.), or, if you still want to stay in touch with them, select the option that lets you either (1) mute their posts from your feed or (2) only see their “important” posts (FB decides what’s important based on number of comments, etc., I believe).
"The ability to reach everyone I know in one place is no longer a novelty. We don’t want to see daily updates from everyone we meet in perpetuity. Facebook’s contingency plan for dealing with its friendship paradox — that ballooning Friends lists both clog the News Feed and make it awkward to share — is its increasingly intelligent algorithm, which aims to show only relevant content in your feed. But algorithms can only go so far when we’re adding new friends quicker than we’re unfriending old ones, and Facebook is afraid to show you the same page twice. When people say, "I hate Facebook," what I think they’re really saying is, "I wish my real friends would post more stuff so my feed wasn’t full of randos.""