I'm trying to develop some KPIs for our website and the idea of number of first posts per month per year came to mind. The query started to make my head spin. Gizmo or Sirdude want to give this one a try?

First post as in topic starter, or first response?

First post by a registered user, whether it is a topic start or a response. We have a number of lurkers who are registered but haven't posted.