Roughly where I was headed. In other words, I don't see this as related to the decline in FB among young people. So
good: users, generally. I think it's evidence that Zuck is trying to deliver on his promise that it would be more about connecting *on* Facebook, rather than sharing clickbaity links for whatever purpose
good: probably Facebook. They keep making it harder and harder to get a free lunch. You want eyeballs? Then pay the good man.
bad: anyone who was getting a lot of free traffic to their business via clickbaity links (see above)
not sure: advertisers