https://www.convinceandconvert.com/convince-and-convert-podcast/the-shocking-roi-of-influencer-marketing/

In my current role we are invested in a company launching a direct to consumer business.  A number of the conversations revolve around the value of digital spend, particularly as it relates to Facebook, Instagram, and Influencers.  With a number of experienced people at the table, I've hear statements such as "the arb in social media is gone" or "facebook is done you won't get a return".  As a less experienced participant, how do you actually know?  

The article above claims that influencer marketing produces a considerable ROI.  It is not clear to me whether or not the 'golden' days or social media advertising are over with more business bidding up the costs relative to the impact on revenue.