I have a sidebar on our intranet which lists, hierarchically, posts by category.
-- HR ---Events ----Picnic
However, this list has gotten long, and some categories are no longer even used. I would like to only category links where there are posts less than a year old.
Right now, I am using the default Categories Widget in the sidebar, but I can use a different widget or hand-code it.
How would I best approach this?