[icebraining]

They can target based on "Behaviours", so, maybe? https://www.facebook.com/business/a/online-sales/ad-targetin...

EDIT: The "Behaviour" targets can even drill down to specific types of alcohol beverages (beer, wine, other). Not sure that means specifically having visited a bar.

[sharemywin]

if any of your friends liked the wine or visited a site and the vendor had a look-a-like audience selected.

or maybe it uses voice recognition to target users "interests"