I think the Fyre Festival fiasco is pretty strong evidence for the efficacy of "influencers." In that case there was no real product to buy, the _only_ reason

I think the Fyre Festival fiasco is pretty strong evidence for the efficacy of "influencers." In that case there was no real product to buy, the _only_ reason to try to buy the product was its advertising, more than 4,000 people did, and its advertising was almost exclusively via social media / influencers.