Filter annotation stream: "types" and "purposes"
At the moment we have a filter category "annotation types", where you can choose to only see "commenting" or "highlighting" annotations.
I would suggest to
a) call this existing filter category "Annotation purposes" (according to wording of the data model) b) add another category with "Annotation types", where you can decide to only see annotations of type "video", "image", "audio" or "text".