"As demonstrated by engagement" - isn't really true. It's more "As demonstrated by count of time spent in the app". I believe that is true. But it's also a worse experience. Those two really seem to contradict each other, however, it's really quite nuanced.

I'd like to see mostly what my friends are up to. Instead of that, on Facebook at least, I mostly see viral videos from whatever groups I happen to be in. It is true that a lot of the time, those suck me into watching them. Technically that counts as "time spend in the app", but I also see that I'm wasting a lot of my time on crappy pointless videos and because of that I've actually not opened the app at all from time to time. In general, my attitude towards it has also changed - it used to be "ooh, exciting, let's see what's happened", now it's more like "meh, maybe this time there is something interesting, let's check, although probably not". Jaded is probably the correct description.