The use case is to generate a list of users ordered by activity, i.e. `question_count` or `answer_count`.

e.g.

<pre>
total_(questions|answers) display_name [user_id]
------------------------------------------
1000 John Doe [12]
900 Joe Snow [431]
. . . etc etc

</pre>
Post your solution to this use case in the language/library syntax of your choice.