When I follow a topic on Hubpages (for example "Literature") , I will get content about Literature in my feed. I will also get content about subcategories in my feed (For example "American Literature"). For me that means that I am followin the subcategory "American Literature" also. However. When I am on the page of American Literature, I get the button "Follow" rather than "Unfollow". How does this work? Perhaps there are different default norification settings for sublevel topics..?