Ah interesting. Yeah, I’m not sure how a full proper ranking or comparison for digital ad market would be done. There’s lot of ad networks including the DSP list. Ad spend perhaps? Most of the major sites or apps that are only for their own property don’t include outside ads. I’m thinking LinkedIn, Pinterest, Snap, Twitter, Reddit, Yelp. I’m not certain on all of this though. Chumbox ads (Taboola, etc) have proliferated to a whole range of sites including top ones by now too.

But then IAC, Verizon Media’s biggest properties, would be a mix of different things.