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with tag list open:

This interface displays a single item at a time, filling the screen. Bob is brought immediately to the first item in his feed. He goes from one item to another using the next and previous buttons.

He saves and shares items using the "save" and "share" buttons. He can mark things using the "tag" button, which would open a new (maybe popup) menu. An example of the tag menu is given in a second drawing. We would either add a separate button for read later items, or add "read later" a tag in the tag menu. In the case of our scenario, suppose Bob hits a "later" button to have his political article show up later.

Bob may confuse the intent of the read later tag with other tags if we include it in the tag menu. Thus we will probably have to add another button. The issue with this is that there are already 8 buttons at the bottom of the screen. This may make learning how to use the interface more difficult for new users, even if the buttons seem straight-forward in use. Next and Previous are familiar affordances from websites that Bob can use to learn how to navigate through his items.

But here it is much harder to see the full effects filtering will have on the entries to read, since we only look at entries one at a time. This will hinder Bob's ability to learn how filtering works (even though this is the reading interface!)

When 
going through each item one at a time will be very slow for Bob. If he is uninterested in the first 10 items, he will have to click the "Next" button 10 times before he sees something interesting, which is very inefficient. We will want to add a birds-eye view interface so Bob can quickly go through items as well.

If Bob realizes he accidentally skipped an entry he was looking for, he will have to hit the "Prev" several times to get back to the correct entry. However updating tags will be easy. There is no "undo" button for any of the interfaces.