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As video hosting is enabled at Steemit, they could do special videos just for Steemit and mention that to their Youtube audience.

Fantastic idea!!

I actually chose to write a bit more about the idea. Feel free to check it out @goldmatters :

https://steemit.com/steemit/@igster/how-to-introduce-steemit-to-your-youtube-audience

Read you article and upvoted! :)