Totally agree with this is why especially FB is winning. Especially in Mobile where every user is pretty a logged in user on FB, Instagram, WhatsApp, etc. Plus

Totally agree with this is why especially FB is winning. Especially in Mobile where every user is pretty a logged in user on FB, Instagram, WhatsApp, etc. Plus non-inferred actual demo data. Even Google can't touch FB... Everyone else who's peddling non-logged impressions with BlueKai data, good luck - first, Bluekai is only accruage 1/3 of the time. Second, majority of those are bot views. Attribution like you describe is notoriously hard to measure. As views get to mobile, FB wins again since most apps use FB auth.