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I'm not sure it is a decentralized Github, but it appears to be connected, and I'm not exactly sure how. I don't think I can use Utopian.io to edit Github and/ or get votes for activity on Github, if that's what you mean. That is what is currently confusing me. They seem to be separate. Hopefully my meager mind will wrap around it soon.

I think the goal of utopian is moving the contents of Github to the Steem blockchain. Not sure though..