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Initial sketch:

Improved sketch:
Image Added

This is an example of a menu that would appear after hitting a save button on the page. Here, Bob's previously created/used "save" tags are listed in the first drop-down menu. Since bob has categorized code-related items before, he will already have a "code-related" tag of some kind in the list. This would just be a special tag that makes sure items don't get deleted. For example, if we add options for the user to delete items that have been around for a long time (month or something), items with the save tags would be ignored.

If Bob wants to see these items again, he just has to specify he wants to see items with the "code-related" save tag under filtering, when he goes back to read them. Then he can read them again using the reading interface.

There will be a "new tag" entry in the first drop-down menu, so Bob can specify a new save tag if the current list of tags don't suit his current needs.

With this interface, he can also specify how long he wants items to be saved with the second drop-down menu.

It's pretty clear what is being saved. But Bob may not realize how to create a new save tag with this design. He would have to explore the drop-down menus to see what they do.

This is pretty efficient for saving a single item. Bob could save an item in 1 tap on his phone using the default menu values. As the list of save tags grows, we can allow scrolling/arranging options for the save tags to speed up the search for the correct tag.

However, if you want to save multiple items, this is not an efficient way to save. We will have to look into options for bulk saving, if this turns out to be a necessary feature for our user population.

The item Bob is trying to save is displayed to make sure he's saving the right thing.

Bob's save choices will remain visible after selecting items from the menus, so he can verify them before he hits the save button.

Initial sketch:

Improved sketch:

With this interface, 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.