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Redlining does not mean simply drawing red polygons on the map. To be guilty of redlining, Facebook must have known the ethnic/racial/religious composition of the excluded areas and it must have known that the advertisers were using the tools for discrimination. Quite a tall order.

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I don't consider it a tall order, it's exactly what I'd expect advertisers to do with these tools, if there was no specific process to prevent them from doing so.

This case hinges on three facts. First, displaying housing ads that exclude protected classes is illegal. Second is that Facebook built tools that allowed advertisers to create said illegal ads. Finally, Facebook had no oversight process to reject potentially illegal ads. The fact that Facebook created tools that allowed advertisers to effectively cause Facebook to break the law in an automated fashion isn't really much of a defense.

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