I love YouTube and when the notification system was first introduced I was told it was a chance for subs to see "every video you upload" I supported or then. But why break this system too? Why let it be only a "if we think the video is good enough" system as well?
I can almost guarantee you that nobody would hit the Subscribe button if they didn't want notifications about every video produced by their chosen creators. Adding more levels to that is not only redundant but damaging.
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.