Facebook is two things for me right now:
1. A lazy way of registering to sites
2. New Urbanist Memes For Transit-Oriented Teens (my feed is exclusively this one right now)
The notifications going a bit mad about 18 months ago or so when they introduced the market stuff and "your friends are interested in going to X" was what ran me off. I'd unsubscribe and unfollow and new worthless ones would take up their place.
Now I don't even bother checking my notifications; I'll log in maybe twice a day to check if I received any messages, have a scroll through NUMTOTs, that's about it.