Roughly knowing how many times each tag has been used would provide users actionable information if they would like to search or filter by tags.

It might improve UX when applying tags, but might have undesirable side effects in user behavior.

I can think of three places this might be implemented, and I don't know which, if any, we want:

When filtering topics by tags:

• informs users how large or small their scope is
• this view should probably be kept somewhat up to date

When looking at a topic's tags:

• informs users where to start searching/filtering
• passively builds a frame of reference for how tags are used?
• this view could be allowed to become outdated and stale without issue

When applying tags

• a more common tag might be less accurate, but it might be more helpful?
• in the auto fill issue weight by frequency was proposed, which is somewhat similar but more opaque
• this should probably use pretty recent counts as well

I just thought that it might be useful for a person to see how many posts and comments they have made on ~. As that data is already available for manual collection it might be nice to have it available more easily on that profile.