Interesting comparison and data.
One thing I might add would be to use statistics from more than one interface for each blockchain. Last I checked (a long time ago) Steemit was the most popular frontend for the Steem blockchain, but is hive.blog even the most used frontend for the Hive blockchain? I know I started using Peakd.com when I switched, and there's a myriad of different interfaces.
That low number for Hive in the total visits category could just be a sign that people are using more different interfaces. This would be a sign of greater decentralization of Hive over Steem, which is what we'd like to see.
I was surprised to see how much more attention Hive gets on Twitter by your reckoning, especially in contrast to the rest of the seemingly Steem dominated platforms.
RE: State of the Fork. (monthly update). "Happy one month anniversary all."