[121789]

I don't think so. I think the more correct way to frame it would be that they are charging for access to the space in a user's feed. Like renting billboard space, except the user data makes it very easy to understand where you should put that billboard.

[btown]

In fact, the adtech industry quite literally refers to these spaces as "inventory" - https://wiki.appnexus.com/display/adnexusdocumentation/Inven...