I don't want to see some random cat video Sarah thought was cute. I can go to /r/kittens myself if I want to see random cute cat videos. I do want to see the video Jen took of her cat because I know him and sometimes feed him when she's out of town.
I think I'm not alone in this, and some of the popularity of Instagram is due to its UX making it easy to upload content directly from a mobile device and not so convenient to share content not created by the user.
I've used the FBPurity browser extension to create a nearly share-free Facebook feed. It reduced the amount of content by 80+% and greatly improved the signal to noise ratio.