I'm always disturbed by the unnecessary notifications of facebook, Notications like 'X' commented on 'Y's photo that you're tagged in. Sometimes I dont know why but some people tag me in their Sh!t posts. Sh!tbook.. And the notifications due to the comments made by others after your comment in a post.. It is totally unnecessary i think, because there is already options of mentions and reply if the comment says something about you.. I am happy that Steemit never does that..