I think it's a mistake and also really strange word choice.
"No longer limited by geography, these people can fill the voids left BY THE shamans and tribal leaders of yesteryear, and the best part is, you get to choose them."
So after reading the article, what I believe they are saying is that just as in the past shamans could speak or communicate with far-off spirits, the internet allows us in the modern day to communicate with people in far-off places. The tribal leaders of the past are the celebrities and role models of today in their comparison.
I think it's a pretty strange metaphor all things considered.