[topspin]

"Host from the main facebook.com domain..."

If true I believe that this would actually be an important improvement. This removes some plausible deniability regarding malware and other abuse; Facebook (or whomever else adopts this scheme) must guard more carefully against abuse when the content is coming from their own domains, as opposed to some third party.

[pbhjpbhj]

Must they? The uninformed layman probably already things the ads come from Facebook[.com] as that's the address site they're visiting.

I expect them still manage to hide behind "common carrier" arguments.

[awad]

As far as I am aware, all ad creative is hosted and served exclusively by Facebook anyway.