I feel that the combination of feeds and sort modes is a bit confusing.
There are four different feeds ("For You", "Featured", "All", "Following"), two of which come with three possible sort modes ("Interesting", "Active", "New") while the other two can't be sorted, for a total of eight different combinations.
The major problem I have is that I mostly want to use the combinations "For You"&"Interesting" and "All"&"New". That means that, to navigate from one to the other, I have to click twice because the choice of sort mode sticks between feeds.
A short-term solution for this might be to allow for each feed to have its own sort mode - but then, I wonder if there isn't some amount of redundancy in these combinations, which could be streamlined a bit. For example, isn't "For You" already the stuff that is "Interesting" to me? And if I already saw the interesting stuff in my "For You" feed, to I need to sort "All" the same way, or wouldn't it be better if "All" was always sorted using one of the other two modes?
A secondary problem is that I tend to forget about the "Following" feed, because it is the only one not accessible via a text button but instead via a star icon. Perhaps the currently three different navigational elements (icons, tabs, pull-down menu) could be combined into just two?