That would be interesing if an ad platforms focused on site by content category, so someone selling graphics cards would buy spots from google or facebook, etc to be placed on a specific site like videogameenthusiastists dot com or more general site like gizmodo, but the dictionary site who might under 3rd party have known that a visitor is a video game enthusiast will no longer receive the ad placements.

Interesting to think about how all of this will change the web, however it works out.