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The cool thing about the blockchain technology is that everyone can look/download the steem blockchain and do analyses on it. @penguinablo is probably doing that, getting the data from the blockchain and give it into some graph software.

Directly from the STEEM blockchain :)
You can connect to the blockchain with Javascript using the Steem.JS Javascript library: https://github.com/steemit/steem-js

Thank you - will take some learning from my side!

Exactly what I was getting ready to ask :)

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