ArcGIS item tags should be displayed on data summary screen
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You can add tags on the arcgis online item page
You can search by tag on the Hubs search page
You can see the first few tags against the results overview page for each of the potential matches to your search.
Once you open an item on hubs, you can only get to the tags by clicking on the metadata tab.
It would be better if they were instead displayed in a field on the hub item page and were hyperlinks that could be clicked and followed to other datasets with that tag
