More recently, after running a script found on here to unfollow everyone in my feed, I've noticed that Facebook will "invent" notifications - someone's birthday, an event near me, etc - to keep the dopamine slot machine going
They crank that stuff up when you haven't visited them in a while as well. It comes off a super desperate if you're not addicted, but I'm sure it must work on someone.
If try to disable your account, the last screen confronts you with big banners saying so-and-so will miss you if you leave Facebook.
Facebook is the most emotionally manipulative application I've ever seen.
Obviously I clicked the unsubscribe link. :D
You used to be able to receive and reply to Facebook messages via email. They took out the reply feature and recently they've taken out the content as well. Now their notifications are just "you have 23 unread messages." Their only goal now seems to be to force you onto their app.