I guess enough people wrote Eric back when he first published on engagement metrics yesterday - so today he offered a clarification.

"…..But Frank raises another really excellent point, albeit indirectly, should visitors who are actively interacting with RSS or XML-based content get a "push" in their engagement score? I mean, based on his response, Frank is doing two of the six things I have identified as "most important" on my site from a content and activity perspective (more on that in my next post), so if I could uniquely identify Frank I could vet whether his score is correct based on his description of his interaction with my site.

In reality I only provided Bill and Frank as examples to show how ultimately engagement needs to take real people's activities into consideration, at least as the metrics are being defined and worked out…"

Because we can't yet define every one's visit to a site (by who they are - the only sure way is through authentication) we can't really get an accurate "Engagement Score" for them, can we? 

And then again, a commentator, Robert, brought up another nail to the coffin of  a real engagement metric:

"…..Frank's response also points out the difference between the data and the customer behavior inferred by the data. In this case in particular, its not just intent being imputed, but Frank's attitude."

I'm still anxious to find out what Eric is going to come up with as an set of measurements I can apply, analytic platform agnostic, that will approximate an Engagement Score (when you don't know all the people visiting your site).