[Barrin92]

not really, because people are aware of the fact that they're going to find say, women targeted ads in cosmo, so they can seek them out. The 'discrimination' in this case is simply aggregate consumer preference, every individual outlier still gets precisely the content and ads they want.

If facebook displays housing ads only to white people a black person is very likely not even aware that they're being discriminated against in some specific way, the entire control is in the hands of facebook and the ad buyer, and intransparent.

The situation would be equivalent if facebook gave you complete control over their algorithm and let you choose what type of ads you want to be exposed to. Which would make discrimination much less of an issue. Or the other way around, the current facebook situation would be akin to the store owner quickly cutting the housing ads out of cosmo as soon as black people walk into the store.