Stop listing of unused Member blogs

Hi,

I have a Buddypress Site with Membership and Supporter plugins.

I would like the ability to not display unused Blogs/Sites for members that have not used them.

I'm not sure what would flag an site as unused. Maybe there could be a check in the blogs-loop.php for membership and blog dates? Say the blog was updated/created the same date as the member registered. Maybe check and not display if the blog still has a "Hello Dolly" Post? In this way it will get listed once the start upating the site.

I'm not looking to *delete* anything, just not display an inactive blog along with the active ones.

Kind regards,
Larry