I think my experience and satisfaction with Facebook has steadily decreased in a linear relationship with how many friends I have on my friends list. My guess is because:
1) the more friends I add, the more likely I am to add that guy on Facebook. The guy who always posts very annoying political posts, or the guy who posts very smug+condescending posts.
2) I find myself comparing with my friends, especially when they post pics of them on vacation or news of some promotion.
3) I spend too much time worrying about how to curate posts and post stuff that a. impresses people and b. doesn't offend anyone.
I probably just care too much what others think, but that's my 2c.