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Interesting..
I know Google has been testing authorship ranking calculations and suspect they have managed to integrate it into rank brain to a certain level after it was taken advantage of during the initial beta testing.
I wonder if Google's rank brain is not just considering the link coming from the Steemit content but a combination of the content link plus the authority of the author which is writing the content scored by the upvotes within the system in combination with the audience of the people upvoting in relation to the link which you are linking too.
Also it looks like Steemit has a few missed opportunities in schema markup for rich snippet opportunities: