Can Amazon put an end to Google and Facebook’s digital duopoly?

Amazon dominates the ecommerce world despite having not made much of an impact in the ad market, but could this be about to change?
At the moment, Facebook and Google have a clear duopoly of the digital advertising market. The pair’s combined market share is set to hit 49% in 2017, according to eMarketer, while Enders Analysis estimates they accounted for 89% of the growth last year.
Central to this dominance has been the unstoppable rise of mobile. In North America, for example, Google co