Wow, this is very cool. I think metrics like these should be visible directly on Steemit on some kind of Author stats/reputation page. That way, it is easier for anybody to get some more feeling with the contributions of the author to the platform :-)
Keep up the good work
It would be very nice to have a way to add this info to the avatar (on hovering for example). The calculation is quite processor intensive though so I don't think it would work at the blockchain level. It would require trusting another external service to provide accurate info, which I guess steemit wants to avoid.