A friend tells me that they see notifications whenever I comment on anything, not just on their posts. Which sounds pretty annoying. I'm not in their close-friends list and they do not see this for any other friends. We don't even interact that much on Facebook.
I can't find notification settings relating to "notify when they post a comment" so what can they do? It's irritating for them and a bit creepy for me FB is deciding to notify one person of every single thing I do.