Pernicious as it may be, ads being able to exclude people is a natural evolution of ads, not something malicious as it has been portrayed often recently.
In the past it was up to the ad buyer to attempt to exclude people based on their wits. I want to use site X because it has these people instead of site Y because it has those people. Totally normal.
Now we are debating on the right to see ads because Facebook has such a powerful platform.
I am all for the debate, what I am not about is acting like this is something other-worldly. The impression based ad, the viewership based ad, and demographics, have worked this way throughout modern history.
Ads have moved from being ostensibly invisible, to literally invisible. That is the line we're drawing?