Not YouTube, but I really do not like what Facebook has done with our notifications: they say they're now filtering our notifications based on "importance," so that whatever notification that feel is of higher importance to you they'll put at the top of the list, while lesser important notifications will be further down. This is just a headache and confusing, because how does Facebook even determine the "importance" of a notification? I mean all these does is just jumble them up to where some of your notifications are at the top, while others you have to scroll down through older/read notifications to find other new ones. I mean, doesn't just filtering notifications by when you get them make too much sense?