This is interesting, however are you talking about a article on medium versus an blog post on your personal website??

Also, is your Facebook page audience people who follow you for advice on medium, or writing in general?

I would imagine that if you had an opt in on your article it would have an incredible return in the long term and $20 dollars well spent, rather that the short term earnings on medium.

Thanks for this report it’s really interesting to see experiments like this.