I think GP was referring to counting the number of OTHER people (I.e. still active users) who wrote a post on the deleted person’s wall. Still, there is no way

I think GP was referring to counting the number of OTHER people (I.e. still active users) who wrote a post on the deleted person’s wall. Still, there is no way I know of to get posts an active account made on an inactive wall, and you would need to get those posts for a significant number of the inactive user’s friends. Probably a bit of a convoluted example but I see the point GP is making.