Pocket, the read later app for articles and videos, has an iOS 8 App Extension that goes the extra step. When you use the extension in other apps, a “Saved!” prompt gives you the good news. But if you tap the tag icon in that prompt, a new sheet appears that lets you also tag that item for your own organization purposes. As icing on the cake, Pocket’s tagging page even includes suggested tags based on how other users have tagged that item (and presumably other similar items).
