I've recently received several friend requests a day from spambots. This is annoying, but I can just ignore the "friend request" tab and go on with my life.
However, as if it wasn't a nuisance enough, Facebook now gives me plain notifications of these friend requests in my normal notification feed. "Spambot is new to Facebook and just sent you a friend request."
I'd switch to only Messenger, but Facebook seems to think that I don't have Messenger, so I keep receiving invites to install Messenger from my friends as it covers half their conversation with me with that notification.