When a user clicks on a topic tag, maybe default to &period=all
When a user clicks on a topic tag they are shown a list of topics with that tag. Currently the period is set to their default period preference.
In my experience 3 days is the best default period in general as it allows new topics to appear high in the feed, but when I click a topic tag, I would like to see all related topics, not filtered by any period.
Note: This is minor, and may only be an issue while the site is still low volume.