“Advertisers are still happy with Amazon as a way to diversify from Google and Facebook,” said Monica Peart, eMarketer’s senior forecasting director. She said brands are also honing in on ecommerce shoppers and transaction data.
There are other mobile and video-focused companies growing share, including Hulu, Roku and Snapchat, Peart said. But their growth tends to be in “rounding error terms” for the overall market, and aren’t enough to dent the larger platforms.