I saw my feed end for the first time in five years a few weeks ago. Once I hit the end of the feed, my inner being was filled with a sense of emptiness. Scary if you think about it. It's really no joke when psychologists say it's like being on drugs. And, as a person with ADHD, limitless scrolling is irresistible. I have taken to disabling it on most sites that implement it (either through official site settings or Firefox extensions).
As for adding more friends on Facebook, most of the lists of my friends and I are basically classmates.com 2.0. It might be because we're growing older (mid 20s), but I also feel that everyone is starting to either leave for other platforms or develop more in-person connections.